feat(ai): add max thinking level

packages/ai/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Added
+
+- Added a separate opt-in `max` thinking level, including native `xhigh` and `max` support for GPT-5.6 and Anthropic adaptive-thinking effort metadata matching Anthropic's documentation: `max` on all adaptive Claude models, native `xhigh` on Opus 4.7/4.8, Sonnet 5, and Fable 5 only.
+
 ### Fixed
 
 - Fixed post-compaction output-token budgeting to ignore stale assistant usage from before the compaction boundary ([#6464](https://github.com/earendil-works/pi/issues/6464)).

packages/ai/README.md

@@ -730,7 +730,7 @@ if (model.reasoning) {
 const response = await models.completeSimple(model, {
   messages: [{ role: 'user', content: 'Solve: 2x + 5 = 13', timestamp: Date.now() }]
 }, {
-  reasoning: 'medium'  // 'minimal' | 'low' | 'medium' | 'high' | 'xhigh'
+  reasoning: 'medium'  // 'minimal' | 'low' | 'medium' | 'high' | 'xhigh' | 'max'
 });
 
 // Access thinking and text blocks
@@ -743,6 +743,8 @@ for (const block of response.content) {
 }
 ```
 
+`xhigh` and `max` are model-specific, opt-in levels. Use `getSupportedThinkingLevels(model)` to determine whether a concrete model exposes either level; models such as GPT-5.6 can expose both.
+
 ### Provider-Specific Options (stream/complete)
 
 `models.stream()`/`complete()` accept the owning API's full option set. Use `hasApi()` to narrow a dynamically looked-up model to its API for full option typing:
@@ -999,7 +1001,7 @@ Custom models can carry `headers` (e.g. proxies behind bot detection) and `compa
 
 Some OpenAI-compatible servers do not understand the `developer` role used for reasoning-capable models. For those providers, set `compat.supportsDeveloperRole` to `false` so the system prompt is sent as a `system` message instead. If the server also does not support `reasoning_effort`, set `compat.supportsReasoningEffort` to `false` too. This commonly applies to Ollama, vLLM, SGLang, and similar OpenAI-compatible servers.
 
-Use model-level `thinkingLevelMap` to describe model-specific thinking controls. Keys are pi thinking levels (`off`, `minimal`, `low`, `medium`, `high`, `xhigh`). Missing keys use provider defaults, string values are sent to the provider, and `null` marks a level unsupported.
+Use model-level `thinkingLevelMap` to describe model-specific thinking controls. Keys are pi thinking levels (`off`, `minimal`, `low`, `medium`, `high`, `xhigh`, `max`). Missing standard levels through `high` use provider defaults; `xhigh` and `max` are opt-in and require a non-null map entry. String values are sent to the provider, `null` marks a level unsupported, and maps may skip levels.
 
 ```typescript
 const ollamaReasoningModel: Model<'openai-completions'> = {

packages/ai/scripts/generate-models.ts

@@ -160,7 +160,7 @@ const ZAI_GLM52_THINKING_LEVEL_MAP = {
 	low: "high",
 	medium: "high",
 	high: "high",
-	xhigh: "max",
+	max: "max",
 } as const;
 const OPENCODE_GO_GLM52_THINKING_LEVEL_MAP = {
 	off: null,
@@ -168,7 +168,7 @@ const OPENCODE_GO_GLM52_THINKING_LEVEL_MAP = {
 	low: null,
 	medium: null,
 	high: "high",
-	xhigh: "max",
+	max: "max",
 } as const;
 const EAGER_TOOL_INPUT_STREAMING_UNSUPPORTED_ANTHROPIC_MODELS = new Set([
 	"github-copilot:claude-haiku-4.5",
@@ -181,7 +181,7 @@ const DEEPSEEK_V4_THINKING_LEVEL_MAP = {
 	low: null,
 	medium: null,
 	high: "high",
-	xhigh: "max",
+	max: "max",
 } as const;
 
 const ANT_LING_RING_THINKING_LEVEL_MAP = {
@@ -235,7 +235,7 @@ const GITHUB_COPILOT_EXTENDED_CONTEXT_MODELS = new Set([
 const GITHUB_COPILOT_THINKING_LEVEL_OVERRIDES = {
 	"claude-opus-4.7": { minimal: "low" },
 	"claude-opus-4.8": { minimal: "low" },
-	"claude-sonnet-4.6": { minimal: "low", xhigh: "max" },
+	"claude-sonnet-4.6": { minimal: "low", max: "max" },
 } satisfies Record<string, NonNullable<Model<Api>["thinkingLevelMap"]>>;
 
 function mergeThinkingLevelMap(model: Model<any>, map: NonNullable<Model<any>["thinkingLevelMap"]>): void {
@@ -271,6 +271,16 @@ function supportsOpenAiXhigh(modelId: string): boolean {
 	);
 }
 
+function supportsOpenAiMax(model: Model<Api>): boolean {
+	return (
+		model.id.includes("gpt-5.6") &&
+		(model.api === "openai-responses" ||
+			model.api === "azure-openai-responses" ||
+			model.api === "openai-codex-responses" ||
+			model.api === "openai-completions")
+	);
+}
+
 function isGoogleThinkingApi(model: Model<any>): boolean {
 	return model.api === "google-generative-ai" || model.api === "google-vertex";
 }
@@ -472,28 +482,41 @@ function applyThinkingLevelMetadata(model: Model<any>): void {
 	if (supportsOpenAiXhigh(model.id)) {
 		mergeThinkingLevelMap(model, { xhigh: "xhigh" });
 	}
+	if (supportsOpenAiMax(model)) {
+		mergeThinkingLevelMap(model, { max: "max" });
+	}
 	if (model.provider === "openai" && model.id === "gpt-5.5") {
 		mergeThinkingLevelMap(model, { minimal: null });
 	}
 	if (model.id.endsWith("gpt-5.5-pro")) {
 		mergeThinkingLevelMap(model, { off: null, minimal: null, low: null });
 	}
-	if (model.id.includes("opus-4-6") || model.id.includes("opus-4.6")) {
-		mergeThinkingLevelMap(model, { xhigh: "max" });
+	// Anthropic adaptive-thinking effort support (per Anthropic adaptive thinking docs):
+	// - "max" is available on all adaptive-thinking Claude models.
+	// - "xhigh" is only available on Opus 4.7/4.8, Sonnet 5, and Fable 5.
+	if (
+		model.id.includes("opus-4-6") ||
+		model.id.includes("opus-4.6") ||
+		model.id.includes("sonnet-4-6") ||
+		model.id.includes("sonnet-4.6")
+	) {
+		mergeThinkingLevelMap(model, { max: "max" });
 	}
 	if (
 		model.id.includes("opus-4-7") ||
 		model.id.includes("opus-4.7") ||
 		model.id.includes("opus-4-8") ||
-		model.id.includes("opus-4.8")
+		model.id.includes("opus-4.8") ||
+		model.id.includes("sonnet-5") ||
+		model.id.includes("sonnet.5")
 	) {
-		mergeThinkingLevelMap(model, { xhigh: "xhigh" });
+		mergeThinkingLevelMap(model, { xhigh: "xhigh", max: "max" });
 	}
 	if (
 		(model.api === "anthropic-messages" || model.api === "bedrock-converse-stream") &&
 		model.id.includes("fable-5")
 	) {
-		mergeThinkingLevelMap(model, { off: null, xhigh: "xhigh" });
+		mergeThinkingLevelMap(model, { off: null, xhigh: "xhigh", max: "max" });
 	}
 	if (model.api === "anthropic-messages" && isAnthropicAdaptiveThinkingModel(model.id)) {
 		mergeAnthropicMessagesCompat(model, { forceAdaptiveThinking: true });
@@ -505,7 +528,7 @@ function applyThinkingLevelMetadata(model: Model<any>): void {
 		mergeThinkingLevelMap(
 			model,
 			model.provider === "openrouter"
-				? { ...DEEPSEEK_V4_THINKING_LEVEL_MAP, xhigh: "xhigh" }
+				? { ...DEEPSEEK_V4_THINKING_LEVEL_MAP, xhigh: "xhigh", max: null }
 				: DEEPSEEK_V4_THINKING_LEVEL_MAP,
 		);
 	}
@@ -544,7 +567,7 @@ function applyThinkingLevelMetadata(model: Model<any>): void {
 		mergeThinkingLevelMap(model, { xhigh: "xhigh" });
 	}
 	if (model.provider === "fireworks" && model.id.includes("glm-5p2")) {
-		mergeThinkingLevelMap(model, { off: "none", minimal: null, low: "high", medium: "high", xhigh: "max" });
+		mergeThinkingLevelMap(model, { off: "none", minimal: null, low: "high", medium: "high", max: "max" });
 	}
 	if (model.provider === "opencode-go" && model.id === "glm-5.2") {
 		mergeThinkingLevelMap(model, OPENCODE_GO_GLM52_THINKING_LEVEL_MAP);

packages/ai/src/api/anthropic-messages.ts

@@ -742,7 +742,8 @@ export const stream: StreamFunction<"anthropic-messages", AnthropicOptions> = (
 
 /**
  * Map ThinkingLevel to Anthropic effort levels for adaptive thinking.
- * Note: effort "max" is only valid on Opus 4.6, while Opus 4.7+ and Fable 5 support "xhigh".
+ * Note: effort "max" is available on all adaptive-thinking Claude models, while native
+ * "xhigh" is only available on Opus 4.7/4.8, Sonnet 5, and Fable 5.
  */
 function mapThinkingLevelToEffort(
 	model: Model<"anthropic-messages">,

packages/ai/src/api/azure-openai-responses.ts

@@ -52,7 +52,7 @@ function formatAzureOpenAIError(error: unknown): string {
 
 // Azure OpenAI Responses-specific options
 export interface AzureOpenAIResponsesOptions extends StreamOptions {
-	reasoningEffort?: "minimal" | "low" | "medium" | "high" | "xhigh";
+	reasoningEffort?: "minimal" | "low" | "medium" | "high" | "xhigh" | "max";
 	reasoningSummary?: "auto" | "detailed" | "concise" | null;
 	azureApiVersion?: string;
 	azureResourceName?: string;

packages/ai/src/api/bedrock-converse-stream.ts

@@ -582,7 +582,9 @@ function supportsAdaptiveThinking(modelId: string, modelName?: string): boolean
 
 function supportsNativeXhighEffort(model: Model<"bedrock-converse-stream">): boolean {
 	const candidates = getModelMatchCandidates(model.id, model.name);
-	return candidates.some((s) => s.includes("opus-4-7") || s.includes("opus-4-8") || s.includes("fable-5"));
+	return candidates.some(
+		(s) => s.includes("opus-4-7") || s.includes("opus-4-8") || s.includes("sonnet-5") || s.includes("fable-5"),
+	);
 }
 
 function mapThinkingLevelToEffort(
@@ -1025,11 +1027,12 @@ function buildAdditionalModelRequestFields(
 						low: 2048,
 						medium: 8192,
 						high: 16384,
-						xhigh: 16384, // Claude doesn't support xhigh, clamp to high
+						xhigh: 16384, // Budget-based Claude clamps extended levels to high
+						max: 16384,
 					};
 
-					// Custom budgets override defaults (xhigh not in ThinkingBudgets, use high)
-					const level = options.reasoning === "xhigh" ? "high" : options.reasoning;
+					// Custom budgets only cover token-based levels through high.
+					const level = options.reasoning === "xhigh" || options.reasoning === "max" ? "high" : options.reasoning;
 					const budget = options.thinkingBudgets?.[level] ?? defaultBudgets[options.reasoning];
 
 					return {

packages/ai/src/api/google-generative-ai.ts

@@ -400,7 +400,7 @@ function buildParams(
 	return params;
 }
 
-type ClampedThinkingLevel = Exclude<ThinkingLevel, "xhigh">;
+type ClampedThinkingLevel = Exclude<ThinkingLevel, "xhigh" | "max">;
 
 function isGemma4Model(model: Model<"google-generative-ai">): boolean {
 	return /gemma-?4/.test(model.id.toLowerCase());

packages/ai/src/api/google-vertex.ts

@@ -498,7 +498,7 @@ function buildParams(
 	return params;
 }
 
-type ClampedThinkingLevel = Exclude<PiThinkingLevel, "xhigh">;
+type ClampedThinkingLevel = Exclude<PiThinkingLevel, "xhigh" | "max">;
 
 function isGemini3ProModel(model: Model<"google-generative-ai">): boolean {
 	return /gemini-3(?:\.\d+)?-pro/.test(model.id.toLowerCase());

packages/ai/src/api/openai-codex-responses.ts

@@ -80,7 +80,7 @@ const CODEX_RESPONSE_STATUSES = new Set<CodexResponseStatus>([
 // ============================================================================
 
 export interface OpenAICodexResponsesOptions extends StreamOptions {
-	reasoningEffort?: "none" | "minimal" | "low" | "medium" | "high" | "xhigh";
+	reasoningEffort?: "none" | "minimal" | "low" | "medium" | "high" | "xhigh" | "max";
 	reasoningSummary?: "auto" | "concise" | "detailed" | "off" | "on" | null;
 	serviceTier?: ResponseCreateParamsStreaming["service_tier"];
 	textVerbosity?: "low" | "medium" | "high";

packages/ai/src/api/openai-completions.ts

@@ -109,7 +109,7 @@ function isEncryptedReasoningDetail(detail: unknown): detail is OpenAIEncryptedR
 
 export interface OpenAICompletionsOptions extends StreamOptions {
 	toolChoice?: "auto" | "none" | "required" | { type: "function"; function: { name: string } };
-	reasoningEffort?: "minimal" | "low" | "medium" | "high" | "xhigh";
+	reasoningEffort?: "minimal" | "low" | "medium" | "high" | "xhigh" | "max";
 }
 
 interface OpenAICompatCacheControl {

packages/ai/src/api/openai-responses.ts

@@ -78,7 +78,7 @@ function formatOpenAIResponsesError(error: unknown): string {
 
 // OpenAI Responses-specific options
 export interface OpenAIResponsesOptions extends StreamOptions {
-	reasoningEffort?: "minimal" | "low" | "medium" | "high" | "xhigh";
+	reasoningEffort?: "minimal" | "low" | "medium" | "high" | "xhigh" | "max";
 	reasoningSummary?: "auto" | "detailed" | "concise" | null;
 	serviceTier?: ResponseCreateParamsStreaming["service_tier"];
 }

packages/ai/src/api/simple-options.ts

@@ -44,8 +44,8 @@ export function buildBaseOptions(
 	};
 }
 
-export function clampReasoning(effort: ThinkingLevel | undefined): Exclude<ThinkingLevel, "xhigh"> | undefined {
-	return effort === "xhigh" ? "high" : effort;
+export function clampReasoning(effort: ThinkingLevel | undefined): Exclude<ThinkingLevel, "xhigh" | "max"> | undefined {
+	return effort === "xhigh" || effort === "max" ? "high" : effort;
 }
 
 export function adjustMaxTokensForThinking(

packages/ai/src/models.ts

@@ -394,7 +394,7 @@ export function calculateCost<TApi extends Api>(model: Model<TApi>, usage: Usage
 	return usage.cost;
 }
 
-const EXTENDED_THINKING_LEVELS: ModelThinkingLevel[] = ["off", "minimal", "low", "medium", "high", "xhigh"];
+const EXTENDED_THINKING_LEVELS: ModelThinkingLevel[] = ["off", "minimal", "low", "medium", "high", "xhigh", "max"];
 
 export function getSupportedThinkingLevels<TApi extends Api>(model: Model<TApi>): ModelThinkingLevel[] {
 	if (!model.reasoning) return ["off"];
@@ -402,7 +402,7 @@ export function getSupportedThinkingLevels<TApi extends Api>(model: Model<TApi>)
 	return EXTENDED_THINKING_LEVELS.filter((level) => {
 		const mapped = model.thinkingLevelMap?.[level];
 		if (mapped === null) return false;
-		if (level === "xhigh") return mapped !== undefined;
+		if (level === "xhigh" || level === "max") return mapped !== undefined;
 		return true;
 	});
 }

packages/ai/src/providers/amazon-bedrock.models.ts

@@ -79,7 +79,7 @@ export const AMAZON_BEDROCK_MODELS = {
 		provider: "amazon-bedrock",
 		baseUrl: "https://bedrock-runtime.us-east-1.amazonaws.com",
 		reasoning: true,
-		thinkingLevelMap: {"off":null,"xhigh":"xhigh"},
+		thinkingLevelMap: {"off":null,"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 10,
@@ -148,7 +148,7 @@ export const AMAZON_BEDROCK_MODELS = {
 		provider: "amazon-bedrock",
 		baseUrl: "https://bedrock-runtime.us-east-1.amazonaws.com",
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"max"},
+		thinkingLevelMap: {"max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -166,7 +166,7 @@ export const AMAZON_BEDROCK_MODELS = {
 		provider: "amazon-bedrock",
 		baseUrl: "https://bedrock-runtime.us-east-1.amazonaws.com",
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -184,7 +184,7 @@ export const AMAZON_BEDROCK_MODELS = {
 		provider: "amazon-bedrock",
 		baseUrl: "https://bedrock-runtime.us-east-1.amazonaws.com",
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -219,6 +219,7 @@ export const AMAZON_BEDROCK_MODELS = {
 		provider: "amazon-bedrock",
 		baseUrl: "https://bedrock-runtime.us-east-1.amazonaws.com",
 		reasoning: true,
+		thinkingLevelMap: {"max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 3,
@@ -236,6 +237,7 @@ export const AMAZON_BEDROCK_MODELS = {
 		provider: "amazon-bedrock",
 		baseUrl: "https://bedrock-runtime.us-east-1.amazonaws.com",
 		reasoning: true,
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 2,
@@ -270,7 +272,7 @@ export const AMAZON_BEDROCK_MODELS = {
 		provider: "amazon-bedrock",
 		baseUrl: "https://bedrock-runtime.us-east-1.amazonaws.com",
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"max"},
+		thinkingLevelMap: {"max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 16.5,
@@ -288,7 +290,7 @@ export const AMAZON_BEDROCK_MODELS = {
 		provider: "amazon-bedrock",
 		baseUrl: "https://bedrock-runtime.us-east-1.amazonaws.com",
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -323,6 +325,7 @@ export const AMAZON_BEDROCK_MODELS = {
 		provider: "amazon-bedrock",
 		baseUrl: "https://bedrock-runtime.us-east-1.amazonaws.com",
 		reasoning: true,
+		thinkingLevelMap: {"max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 3.3,
@@ -340,6 +343,7 @@ export const AMAZON_BEDROCK_MODELS = {
 		provider: "amazon-bedrock",
 		baseUrl: "https://bedrock-runtime.us-east-1.amazonaws.com",
 		reasoning: true,
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 2,
@@ -408,7 +412,7 @@ export const AMAZON_BEDROCK_MODELS = {
 		provider: "amazon-bedrock",
 		baseUrl: "https://bedrock-runtime.eu-central-1.amazonaws.com",
 		reasoning: true,
-		thinkingLevelMap: {"off":null,"xhigh":"xhigh"},
+		thinkingLevelMap: {"off":null,"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 11,
@@ -460,7 +464,7 @@ export const AMAZON_BEDROCK_MODELS = {
 		provider: "amazon-bedrock",
 		baseUrl: "https://bedrock-runtime.eu-central-1.amazonaws.com",
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"max"},
+		thinkingLevelMap: {"max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5.5,
@@ -478,7 +482,7 @@ export const AMAZON_BEDROCK_MODELS = {
 		provider: "amazon-bedrock",
 		baseUrl: "https://bedrock-runtime.eu-central-1.amazonaws.com",
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5.5,
@@ -496,7 +500,7 @@ export const AMAZON_BEDROCK_MODELS = {
 		provider: "amazon-bedrock",
 		baseUrl: "https://bedrock-runtime.eu-central-1.amazonaws.com",
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5.5,
@@ -531,6 +535,7 @@ export const AMAZON_BEDROCK_MODELS = {
 		provider: "amazon-bedrock",
 		baseUrl: "https://bedrock-runtime.eu-central-1.amazonaws.com",
 		reasoning: true,
+		thinkingLevelMap: {"max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 3.3,
@@ -548,6 +553,7 @@ export const AMAZON_BEDROCK_MODELS = {
 		provider: "amazon-bedrock",
 		baseUrl: "https://bedrock-runtime.eu-central-1.amazonaws.com",
 		reasoning: true,
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 2.2,
@@ -565,7 +571,7 @@ export const AMAZON_BEDROCK_MODELS = {
 		provider: "amazon-bedrock",
 		baseUrl: "https://bedrock-runtime.us-east-1.amazonaws.com",
 		reasoning: true,
-		thinkingLevelMap: {"off":null,"xhigh":"xhigh"},
+		thinkingLevelMap: {"off":null,"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 10,
@@ -617,7 +623,7 @@ export const AMAZON_BEDROCK_MODELS = {
 		provider: "amazon-bedrock",
 		baseUrl: "https://bedrock-runtime.us-east-1.amazonaws.com",
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"max"},
+		thinkingLevelMap: {"max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -635,7 +641,7 @@ export const AMAZON_BEDROCK_MODELS = {
 		provider: "amazon-bedrock",
 		baseUrl: "https://bedrock-runtime.us-east-1.amazonaws.com",
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -653,7 +659,7 @@ export const AMAZON_BEDROCK_MODELS = {
 		provider: "amazon-bedrock",
 		baseUrl: "https://bedrock-runtime.us-east-1.amazonaws.com",
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -688,6 +694,7 @@ export const AMAZON_BEDROCK_MODELS = {
 		provider: "amazon-bedrock",
 		baseUrl: "https://bedrock-runtime.us-east-1.amazonaws.com",
 		reasoning: true,
+		thinkingLevelMap: {"max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 3,
@@ -705,6 +712,7 @@ export const AMAZON_BEDROCK_MODELS = {
 		provider: "amazon-bedrock",
 		baseUrl: "https://bedrock-runtime.us-east-1.amazonaws.com",
 		reasoning: true,
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 2,
@@ -773,7 +781,7 @@ export const AMAZON_BEDROCK_MODELS = {
 		provider: "amazon-bedrock",
 		baseUrl: "https://bedrock-runtime.us-east-1.amazonaws.com",
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -791,7 +799,7 @@ export const AMAZON_BEDROCK_MODELS = {
 		provider: "amazon-bedrock",
 		baseUrl: "https://bedrock-runtime.us-east-1.amazonaws.com",
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -826,6 +834,7 @@ export const AMAZON_BEDROCK_MODELS = {
 		provider: "amazon-bedrock",
 		baseUrl: "https://bedrock-runtime.us-east-1.amazonaws.com",
 		reasoning: true,
+		thinkingLevelMap: {"max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 3,
@@ -843,6 +852,7 @@ export const AMAZON_BEDROCK_MODELS = {
 		provider: "amazon-bedrock",
 		baseUrl: "https://bedrock-runtime.us-east-1.amazonaws.com",
 		reasoning: true,
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 2,
@@ -1508,7 +1518,7 @@ export const AMAZON_BEDROCK_MODELS = {
 		provider: "amazon-bedrock",
 		baseUrl: "https://bedrock-runtime.us-east-1.amazonaws.com",
 		reasoning: true,
-		thinkingLevelMap: {"off":null,"xhigh":"xhigh"},
+		thinkingLevelMap: {"off":null,"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 10,
@@ -1577,7 +1587,7 @@ export const AMAZON_BEDROCK_MODELS = {
 		provider: "amazon-bedrock",
 		baseUrl: "https://bedrock-runtime.us-east-1.amazonaws.com",
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"max"},
+		thinkingLevelMap: {"max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -1595,7 +1605,7 @@ export const AMAZON_BEDROCK_MODELS = {
 		provider: "amazon-bedrock",
 		baseUrl: "https://bedrock-runtime.us-east-1.amazonaws.com",
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -1613,7 +1623,7 @@ export const AMAZON_BEDROCK_MODELS = {
 		provider: "amazon-bedrock",
 		baseUrl: "https://bedrock-runtime.us-east-1.amazonaws.com",
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -1648,6 +1658,7 @@ export const AMAZON_BEDROCK_MODELS = {
 		provider: "amazon-bedrock",
 		baseUrl: "https://bedrock-runtime.us-east-1.amazonaws.com",
 		reasoning: true,
+		thinkingLevelMap: {"max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 3,
@@ -1665,6 +1676,7 @@ export const AMAZON_BEDROCK_MODELS = {
 		provider: "amazon-bedrock",
 		baseUrl: "https://bedrock-runtime.us-east-1.amazonaws.com",
 		reasoning: true,
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 2,

packages/ai/src/providers/anthropic.models.ts

@@ -12,7 +12,7 @@ export const ANTHROPIC_MODELS = {
 		baseUrl: "https://api.anthropic.com",
 		compat: {"forceAdaptiveThinking":true},
 		reasoning: true,
-		thinkingLevelMap: {"off":null,"xhigh":"xhigh"},
+		thinkingLevelMap: {"off":null,"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 10,
@@ -133,7 +133,7 @@ export const ANTHROPIC_MODELS = {
 		baseUrl: "https://api.anthropic.com",
 		compat: {"forceAdaptiveThinking":true},
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"max"},
+		thinkingLevelMap: {"max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -152,7 +152,7 @@ export const ANTHROPIC_MODELS = {
 		baseUrl: "https://api.anthropic.com",
 		compat: {"forceAdaptiveThinking":true,"supportsTemperature":false},
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -171,7 +171,7 @@ export const ANTHROPIC_MODELS = {
 		baseUrl: "https://api.anthropic.com",
 		compat: {"forceAdaptiveThinking":true,"supportsTemperature":false},
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -224,6 +224,7 @@ export const ANTHROPIC_MODELS = {
 		baseUrl: "https://api.anthropic.com",
 		compat: {"forceAdaptiveThinking":true},
 		reasoning: true,
+		thinkingLevelMap: {"max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 3,
@@ -242,6 +243,7 @@ export const ANTHROPIC_MODELS = {
 		baseUrl: "https://api.anthropic.com",
 		compat: {"forceAdaptiveThinking":true},
 		reasoning: true,
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 2,

packages/ai/src/providers/azure-openai-responses.models.ts

@@ -613,7 +613,7 @@ export const AZURE_OPENAI_RESPONSES_MODELS = {
 		provider: "azure-openai-responses",
 		baseUrl: "",
 		reasoning: true,
-		thinkingLevelMap: {"off":null,"xhigh":"xhigh"},
+		thinkingLevelMap: {"off":null,"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -631,7 +631,7 @@ export const AZURE_OPENAI_RESPONSES_MODELS = {
 		provider: "azure-openai-responses",
 		baseUrl: "",
 		reasoning: true,
-		thinkingLevelMap: {"off":null,"xhigh":"xhigh"},
+		thinkingLevelMap: {"off":null,"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 1,
@@ -649,7 +649,7 @@ export const AZURE_OPENAI_RESPONSES_MODELS = {
 		provider: "azure-openai-responses",
 		baseUrl: "",
 		reasoning: true,
-		thinkingLevelMap: {"off":null,"xhigh":"xhigh"},
+		thinkingLevelMap: {"off":null,"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -667,7 +667,7 @@ export const AZURE_OPENAI_RESPONSES_MODELS = {
 		provider: "azure-openai-responses",
 		baseUrl: "",
 		reasoning: true,
-		thinkingLevelMap: {"off":null,"xhigh":"xhigh"},
+		thinkingLevelMap: {"off":null,"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 2.5,

packages/ai/src/providers/cloudflare-ai-gateway.models.ts

@@ -120,7 +120,7 @@ export const CLOUDFLARE_AI_GATEWAY_MODELS = {
 		baseUrl: "https://gateway.ai.cloudflare.com/v1/{CLOUDFLARE_ACCOUNT_ID}/{CLOUDFLARE_GATEWAY_ID}/anthropic",
 		compat: {"sendSessionAffinityHeaders":true,"forceAdaptiveThinking":true},
 		reasoning: true,
-		thinkingLevelMap: {"off":null,"xhigh":"xhigh"},
+		thinkingLevelMap: {"off":null,"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 10,
@@ -211,7 +211,7 @@ export const CLOUDFLARE_AI_GATEWAY_MODELS = {
 		baseUrl: "https://gateway.ai.cloudflare.com/v1/{CLOUDFLARE_ACCOUNT_ID}/{CLOUDFLARE_GATEWAY_ID}/anthropic",
 		compat: {"sendSessionAffinityHeaders":true,"forceAdaptiveThinking":true},
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"max"},
+		thinkingLevelMap: {"max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -230,7 +230,7 @@ export const CLOUDFLARE_AI_GATEWAY_MODELS = {
 		baseUrl: "https://gateway.ai.cloudflare.com/v1/{CLOUDFLARE_ACCOUNT_ID}/{CLOUDFLARE_GATEWAY_ID}/anthropic",
 		compat: {"sendSessionAffinityHeaders":true,"forceAdaptiveThinking":true,"supportsTemperature":false},
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -249,7 +249,7 @@ export const CLOUDFLARE_AI_GATEWAY_MODELS = {
 		baseUrl: "https://gateway.ai.cloudflare.com/v1/{CLOUDFLARE_ACCOUNT_ID}/{CLOUDFLARE_GATEWAY_ID}/anthropic",
 		compat: {"sendSessionAffinityHeaders":true,"forceAdaptiveThinking":true,"supportsTemperature":false},
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -304,6 +304,7 @@ export const CLOUDFLARE_AI_GATEWAY_MODELS = {
 		baseUrl: "https://gateway.ai.cloudflare.com/v1/{CLOUDFLARE_ACCOUNT_ID}/{CLOUDFLARE_GATEWAY_ID}/anthropic",
 		compat: {"sendSessionAffinityHeaders":true,"forceAdaptiveThinking":true},
 		reasoning: true,
+		thinkingLevelMap: {"max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 3,
@@ -322,6 +323,7 @@ export const CLOUDFLARE_AI_GATEWAY_MODELS = {
 		baseUrl: "https://gateway.ai.cloudflare.com/v1/{CLOUDFLARE_ACCOUNT_ID}/{CLOUDFLARE_GATEWAY_ID}/anthropic",
 		compat: {"sendSessionAffinityHeaders":true,"forceAdaptiveThinking":true},
 		reasoning: true,
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 2,

packages/ai/src/providers/deepseek.models.ts

@@ -12,7 +12,7 @@ export const DEEPSEEK_MODELS = {
 		baseUrl: "https://api.deepseek.com",
 		compat: {"supportsStore":false,"supportsDeveloperRole":false,"requiresReasoningContentOnAssistantMessages":true,"thinkingFormat":"deepseek"},
 		reasoning: true,
-		thinkingLevelMap: {"minimal":null,"low":null,"medium":null,"high":"high","xhigh":"max"},
+		thinkingLevelMap: {"minimal":null,"low":null,"medium":null,"high":"high","max":"max"},
 		input: ["text"],
 		cost: {
 			input: 0.14,
@@ -31,7 +31,7 @@ export const DEEPSEEK_MODELS = {
 		baseUrl: "https://api.deepseek.com",
 		compat: {"supportsStore":false,"supportsDeveloperRole":false,"requiresReasoningContentOnAssistantMessages":true,"thinkingFormat":"deepseek"},
 		reasoning: true,
-		thinkingLevelMap: {"minimal":null,"low":null,"medium":null,"high":"high","xhigh":"max"},
+		thinkingLevelMap: {"minimal":null,"low":null,"medium":null,"high":"high","max":"max"},
 		input: ["text"],
 		cost: {
 			input: 0.435,

packages/ai/src/providers/fireworks.models.ts

@@ -66,7 +66,7 @@ export const FIREWORKS_MODELS = {
 		baseUrl: "https://api.fireworks.ai/inference/v1",
 		compat: {"supportsStore":false,"supportsDeveloperRole":false},
 		reasoning: true,
-		thinkingLevelMap: {"off":"none","minimal":null,"low":"high","medium":"high","xhigh":"max"},
+		thinkingLevelMap: {"off":"none","minimal":null,"low":"high","medium":"high","max":"max"},
 		input: ["text"],
 		cost: {
 			input: 1.4,
@@ -229,7 +229,7 @@ export const FIREWORKS_MODELS = {
 		baseUrl: "https://api.fireworks.ai/inference/v1",
 		compat: {"supportsStore":false,"supportsDeveloperRole":false},
 		reasoning: true,
-		thinkingLevelMap: {"off":"none","minimal":null,"low":"high","medium":"high","xhigh":"max"},
+		thinkingLevelMap: {"off":"none","minimal":null,"low":"high","medium":"high","max":"max"},
 		input: ["text"],
 		cost: {
 			input: 2.1,

packages/ai/src/providers/github-copilot.models.ts

@@ -69,7 +69,7 @@ export const GITHUB_COPILOT_MODELS = {
 		headers: {"User-Agent":"GitHubCopilotChat/0.35.0","Editor-Version":"vscode/1.107.0","Editor-Plugin-Version":"copilot-chat/0.35.0","Copilot-Integration-Id":"vscode-chat"},
 		compat: {"forceAdaptiveThinking":true},
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"max"},
+		thinkingLevelMap: {"max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -89,7 +89,7 @@ export const GITHUB_COPILOT_MODELS = {
 		headers: {"User-Agent":"GitHubCopilotChat/0.35.0","Editor-Version":"vscode/1.107.0","Editor-Plugin-Version":"copilot-chat/0.35.0","Copilot-Integration-Id":"vscode-chat"},
 		compat: {"forceAdaptiveThinking":true,"supportsTemperature":false},
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh","minimal":"low"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max","minimal":"low"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -109,7 +109,7 @@ export const GITHUB_COPILOT_MODELS = {
 		headers: {"User-Agent":"GitHubCopilotChat/0.35.0","Editor-Version":"vscode/1.107.0","Editor-Plugin-Version":"copilot-chat/0.35.0","Copilot-Integration-Id":"vscode-chat"},
 		compat: {"forceAdaptiveThinking":true,"supportsTemperature":false},
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh","minimal":"low"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max","minimal":"low"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -167,7 +167,7 @@ export const GITHUB_COPILOT_MODELS = {
 		headers: {"User-Agent":"GitHubCopilotChat/0.35.0","Editor-Version":"vscode/1.107.0","Editor-Plugin-Version":"copilot-chat/0.35.0","Copilot-Integration-Id":"vscode-chat"},
 		compat: {"forceAdaptiveThinking":true},
 		reasoning: true,
-		thinkingLevelMap: {"minimal":"low","xhigh":"max"},
+		thinkingLevelMap: {"max":"max","minimal":"low"},
 		input: ["text", "image"],
 		cost: {
 			input: 3,
@@ -187,6 +187,7 @@ export const GITHUB_COPILOT_MODELS = {
 		headers: {"User-Agent":"GitHubCopilotChat/0.35.0","Editor-Version":"vscode/1.107.0","Editor-Plugin-Version":"copilot-chat/0.35.0","Copilot-Integration-Id":"vscode-chat"},
 		compat: {"forceAdaptiveThinking":true},
 		reasoning: true,
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 2,

packages/ai/src/providers/openai-codex.models.ts

@@ -83,7 +83,7 @@ export const OPENAI_CODEX_MODELS = {
 		provider: "openai-codex",
 		baseUrl: "https://chatgpt.com/backend-api",
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh","minimal":"low"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max","minimal":"low"},
 		input: ["text", "image"],
 		cost: {
 			input: 1,
@@ -101,7 +101,7 @@ export const OPENAI_CODEX_MODELS = {
 		provider: "openai-codex",
 		baseUrl: "https://chatgpt.com/backend-api",
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh","minimal":"low"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max","minimal":"low"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -119,7 +119,7 @@ export const OPENAI_CODEX_MODELS = {
 		provider: "openai-codex",
 		baseUrl: "https://chatgpt.com/backend-api",
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh","minimal":"low"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max","minimal":"low"},
 		input: ["text", "image"],
 		cost: {
 			input: 2.5,

packages/ai/src/providers/openai.models.ts

@@ -613,7 +613,7 @@ export const OPENAI_MODELS = {
 		provider: "openai",
 		baseUrl: "https://api.openai.com/v1",
 		reasoning: true,
-		thinkingLevelMap: {"off":"none","xhigh":"xhigh"},
+		thinkingLevelMap: {"off":"none","xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -631,7 +631,7 @@ export const OPENAI_MODELS = {
 		provider: "openai",
 		baseUrl: "https://api.openai.com/v1",
 		reasoning: true,
-		thinkingLevelMap: {"off":"none","xhigh":"xhigh"},
+		thinkingLevelMap: {"off":"none","xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 1,
@@ -649,7 +649,7 @@ export const OPENAI_MODELS = {
 		provider: "openai",
 		baseUrl: "https://api.openai.com/v1",
 		reasoning: true,
-		thinkingLevelMap: {"off":"none","xhigh":"xhigh"},
+		thinkingLevelMap: {"off":"none","xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -667,7 +667,7 @@ export const OPENAI_MODELS = {
 		provider: "openai",
 		baseUrl: "https://api.openai.com/v1",
 		reasoning: true,
-		thinkingLevelMap: {"off":"none","xhigh":"xhigh"},
+		thinkingLevelMap: {"off":"none","xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 2.5,

packages/ai/src/providers/opencode-go.models.ts

@@ -12,7 +12,7 @@ export const OPENCODE_GO_MODELS = {
 		baseUrl: "https://opencode.ai/zen/go/v1",
 		compat: {"supportsStore":false,"supportsDeveloperRole":false,"maxTokensField":"max_tokens","requiresReasoningContentOnAssistantMessages":true,"thinkingFormat":"deepseek"},
 		reasoning: true,
-		thinkingLevelMap: {"minimal":null,"low":null,"medium":null,"high":"high","xhigh":"max"},
+		thinkingLevelMap: {"minimal":null,"low":null,"medium":null,"high":"high","max":"max"},
 		input: ["text"],
 		cost: {
 			input: 0.14,
@@ -31,7 +31,7 @@ export const OPENCODE_GO_MODELS = {
 		baseUrl: "https://opencode.ai/zen/go/v1",
 		compat: {"supportsStore":false,"supportsDeveloperRole":false,"maxTokensField":"max_tokens","requiresReasoningContentOnAssistantMessages":true,"thinkingFormat":"deepseek"},
 		reasoning: true,
-		thinkingLevelMap: {"minimal":null,"low":null,"medium":null,"high":"high","xhigh":"max"},
+		thinkingLevelMap: {"minimal":null,"low":null,"medium":null,"high":"high","max":"max"},
 		input: ["text"],
 		cost: {
 			input: 1.74,
@@ -68,7 +68,7 @@ export const OPENCODE_GO_MODELS = {
 		baseUrl: "https://opencode.ai/zen/go/v1",
 		compat: {"supportsStore":false,"supportsDeveloperRole":false,"maxTokensField":"max_tokens"},
 		reasoning: true,
-		thinkingLevelMap: {"off":null,"minimal":null,"low":null,"medium":null,"high":"high","xhigh":"max"},
+		thinkingLevelMap: {"off":null,"minimal":null,"low":null,"medium":null,"high":"high","max":"max"},
 		input: ["text"],
 		cost: {
 			input: 1.4,

packages/ai/src/providers/opencode.models.ts

@@ -30,7 +30,7 @@ export const OPENCODE_MODELS = {
 		baseUrl: "https://opencode.ai/zen",
 		compat: {"forceAdaptiveThinking":true},
 		reasoning: true,
-		thinkingLevelMap: {"off":null,"xhigh":"xhigh"},
+		thinkingLevelMap: {"off":null,"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 10,
@@ -100,7 +100,7 @@ export const OPENCODE_MODELS = {
 		baseUrl: "https://opencode.ai/zen",
 		compat: {"forceAdaptiveThinking":true},
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"max"},
+		thinkingLevelMap: {"max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -119,7 +119,7 @@ export const OPENCODE_MODELS = {
 		baseUrl: "https://opencode.ai/zen",
 		compat: {"forceAdaptiveThinking":true,"supportsTemperature":false},
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -138,7 +138,7 @@ export const OPENCODE_MODELS = {
 		baseUrl: "https://opencode.ai/zen",
 		compat: {"forceAdaptiveThinking":true,"supportsTemperature":false},
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -191,6 +191,7 @@ export const OPENCODE_MODELS = {
 		baseUrl: "https://opencode.ai/zen",
 		compat: {"forceAdaptiveThinking":true},
 		reasoning: true,
+		thinkingLevelMap: {"max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 3,
@@ -209,6 +210,7 @@ export const OPENCODE_MODELS = {
 		baseUrl: "https://opencode.ai/zen",
 		compat: {"forceAdaptiveThinking":true},
 		reasoning: true,
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 2,
@@ -227,7 +229,7 @@ export const OPENCODE_MODELS = {
 		baseUrl: "https://opencode.ai/zen/v1",
 		compat: {"supportsStore":false,"supportsDeveloperRole":false,"maxTokensField":"max_tokens","supportsLongCacheRetention":false,"requiresReasoningContentOnAssistantMessages":true},
 		reasoning: true,
-		thinkingLevelMap: {"minimal":null,"low":null,"medium":null,"high":"high","xhigh":"max"},
+		thinkingLevelMap: {"minimal":null,"low":null,"medium":null,"high":"high","max":"max"},
 		input: ["text"],
 		cost: {
 			input: 0.14,
@@ -246,7 +248,7 @@ export const OPENCODE_MODELS = {
 		baseUrl: "https://opencode.ai/zen/v1",
 		compat: {"supportsStore":false,"supportsDeveloperRole":false,"maxTokensField":"max_tokens","requiresReasoningContentOnAssistantMessages":true},
 		reasoning: true,
-		thinkingLevelMap: {"minimal":null,"low":null,"medium":null,"high":"high","xhigh":"max"},
+		thinkingLevelMap: {"minimal":null,"low":null,"medium":null,"high":"high","max":"max"},
 		input: ["text"],
 		cost: {
 			input: 0,
@@ -265,7 +267,7 @@ export const OPENCODE_MODELS = {
 		baseUrl: "https://opencode.ai/zen/v1",
 		compat: {"supportsStore":false,"supportsDeveloperRole":false,"maxTokensField":"max_tokens","supportsLongCacheRetention":false,"requiresReasoningContentOnAssistantMessages":true},
 		reasoning: true,
-		thinkingLevelMap: {"minimal":null,"low":null,"medium":null,"high":"high","xhigh":"max"},
+		thinkingLevelMap: {"minimal":null,"low":null,"medium":null,"high":"high","max":"max"},
 		input: ["text"],
 		cost: {
 			input: 1.74,

packages/ai/src/providers/openrouter.models.ts

@@ -282,7 +282,7 @@ export const OPENROUTER_MODELS = {
 		baseUrl: "https://openrouter.ai/api/v1",
 		compat: {"thinkingFormat":"openrouter","cacheControlFormat":"anthropic"},
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"max"},
+		thinkingLevelMap: {"max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -301,7 +301,7 @@ export const OPENROUTER_MODELS = {
 		baseUrl: "https://openrouter.ai/api/v1",
 		compat: {"thinkingFormat":"openrouter","cacheControlFormat":"anthropic"},
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -320,7 +320,7 @@ export const OPENROUTER_MODELS = {
 		baseUrl: "https://openrouter.ai/api/v1",
 		compat: {"thinkingFormat":"openrouter","cacheControlFormat":"anthropic"},
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 30,
@@ -339,7 +339,7 @@ export const OPENROUTER_MODELS = {
 		baseUrl: "https://openrouter.ai/api/v1",
 		compat: {"thinkingFormat":"openrouter","cacheControlFormat":"anthropic"},
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -358,7 +358,7 @@ export const OPENROUTER_MODELS = {
 		baseUrl: "https://openrouter.ai/api/v1",
 		compat: {"thinkingFormat":"openrouter","cacheControlFormat":"anthropic"},
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 10,
@@ -413,6 +413,7 @@ export const OPENROUTER_MODELS = {
 		baseUrl: "https://openrouter.ai/api/v1",
 		compat: {"thinkingFormat":"openrouter","cacheControlFormat":"anthropic"},
 		reasoning: true,
+		thinkingLevelMap: {"max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 3,
@@ -431,6 +432,7 @@ export const OPENROUTER_MODELS = {
 		baseUrl: "https://openrouter.ai/api/v1",
 		compat: {"thinkingFormat":"openrouter","cacheControlFormat":"anthropic"},
 		reasoning: true,
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 2,
@@ -791,7 +793,7 @@ export const OPENROUTER_MODELS = {
 		baseUrl: "https://openrouter.ai/api/v1",
 		compat: {"supportsDeveloperRole":false,"thinkingFormat":"openrouter","requiresReasoningContentOnAssistantMessages":true},
 		reasoning: true,
-		thinkingLevelMap: {"minimal":null,"low":null,"medium":null,"high":"high","xhigh":"xhigh"},
+		thinkingLevelMap: {"minimal":null,"low":null,"medium":null,"high":"high","max":null,"xhigh":"xhigh"},
 		input: ["text"],
 		cost: {
 			input: 0.09,
@@ -810,7 +812,7 @@ export const OPENROUTER_MODELS = {
 		baseUrl: "https://openrouter.ai/api/v1",
 		compat: {"supportsDeveloperRole":false,"thinkingFormat":"openrouter","requiresReasoningContentOnAssistantMessages":true},
 		reasoning: true,
-		thinkingLevelMap: {"minimal":null,"low":null,"medium":null,"high":"high","xhigh":"xhigh"},
+		thinkingLevelMap: {"minimal":null,"low":null,"medium":null,"high":"high","max":null,"xhigh":"xhigh"},
 		input: ["text"],
 		cost: {
 			input: 0.435,
@@ -1486,7 +1488,7 @@ export const OPENROUTER_MODELS = {
 			cacheWrite: 0,
 		},
 		contextWindow: 1048576,
-		maxTokens: 512000,
+		maxTokens: 131072,
 	} satisfies Model<"openai-completions">,
 	"mistralai/codestral-2508": {
 		id: "mistralai/codestral-2508",
@@ -2804,7 +2806,7 @@ export const OPENROUTER_MODELS = {
 		baseUrl: "https://openrouter.ai/api/v1",
 		compat: {"thinkingFormat":"openrouter"},
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 1,
@@ -2823,7 +2825,7 @@ export const OPENROUTER_MODELS = {
 		baseUrl: "https://openrouter.ai/api/v1",
 		compat: {"thinkingFormat":"openrouter"},
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 1,
@@ -2842,7 +2844,7 @@ export const OPENROUTER_MODELS = {
 		baseUrl: "https://openrouter.ai/api/v1",
 		compat: {"thinkingFormat":"openrouter"},
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -2861,7 +2863,7 @@ export const OPENROUTER_MODELS = {
 		baseUrl: "https://openrouter.ai/api/v1",
 		compat: {"thinkingFormat":"openrouter"},
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -2880,7 +2882,7 @@ export const OPENROUTER_MODELS = {
 		baseUrl: "https://openrouter.ai/api/v1",
 		compat: {"thinkingFormat":"openrouter"},
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 2.5,
@@ -2899,7 +2901,7 @@ export const OPENROUTER_MODELS = {
 		baseUrl: "https://openrouter.ai/api/v1",
 		compat: {"thinkingFormat":"openrouter"},
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 2.5,

packages/ai/src/providers/vercel-ai-gateway.models.ts

@@ -522,7 +522,7 @@ export const VERCEL_AI_GATEWAY_MODELS = {
 		baseUrl: "https://ai-gateway.vercel.sh",
 		compat: {"forceAdaptiveThinking":true},
 		reasoning: true,
-		thinkingLevelMap: {"off":null,"xhigh":"xhigh"},
+		thinkingLevelMap: {"off":null,"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 10,
@@ -609,7 +609,7 @@ export const VERCEL_AI_GATEWAY_MODELS = {
 		baseUrl: "https://ai-gateway.vercel.sh",
 		compat: {"forceAdaptiveThinking":true},
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"max"},
+		thinkingLevelMap: {"max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -628,7 +628,7 @@ export const VERCEL_AI_GATEWAY_MODELS = {
 		baseUrl: "https://ai-gateway.vercel.sh",
 		compat: {"forceAdaptiveThinking":true,"supportsTemperature":false},
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -647,7 +647,7 @@ export const VERCEL_AI_GATEWAY_MODELS = {
 		baseUrl: "https://ai-gateway.vercel.sh",
 		compat: {"forceAdaptiveThinking":true,"supportsTemperature":false},
 		reasoning: true,
-		thinkingLevelMap: {"xhigh":"xhigh"},
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 5,
@@ -700,6 +700,7 @@ export const VERCEL_AI_GATEWAY_MODELS = {
 		baseUrl: "https://ai-gateway.vercel.sh",
 		compat: {"forceAdaptiveThinking":true},
 		reasoning: true,
+		thinkingLevelMap: {"max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 3,
@@ -718,6 +719,7 @@ export const VERCEL_AI_GATEWAY_MODELS = {
 		baseUrl: "https://ai-gateway.vercel.sh",
 		compat: {"forceAdaptiveThinking":true},
 		reasoning: true,
+		thinkingLevelMap: {"xhigh":"xhigh","max":"max"},
 		input: ["text", "image"],
 		cost: {
 			input: 2,

packages/ai/src/providers/zai-coding-cn.models.ts

@@ -84,7 +84,7 @@ export const ZAI_CODING_CN_MODELS = {
 		baseUrl: "https://open.bigmodel.cn/api/coding/paas/v4",
 		compat: {"supportsStore":false,"supportsDeveloperRole":false,"supportsReasoningEffort":true,"thinkingFormat":"zai","zaiToolStream":true},
 		reasoning: true,
-		thinkingLevelMap: {"minimal":null,"low":"high","medium":"high","high":"high","xhigh":"max"},
+		thinkingLevelMap: {"minimal":null,"low":"high","medium":"high","high":"high","max":"max"},
 		input: ["text"],
 		cost: {
 			input: 0,

packages/ai/src/providers/zai.models.ts

@@ -84,7 +84,7 @@ export const ZAI_MODELS = {
 		baseUrl: "https://api.z.ai/api/coding/paas/v4",
 		compat: {"supportsStore":false,"supportsDeveloperRole":false,"supportsReasoningEffort":true,"thinkingFormat":"zai","zaiToolStream":true},
 		reasoning: true,
-		thinkingLevelMap: {"minimal":null,"low":"high","medium":"high","high":"high","xhigh":"max"},
+		thinkingLevelMap: {"minimal":null,"low":"high","medium":"high","high":"high","max":"max"},
 		input: ["text"],
 		cost: {
 			input: 0,

packages/ai/src/types.ts

@@ -71,7 +71,7 @@ export type KnownImagesProvider = "openrouter";
 
 export type ImagesProviderId = KnownImagesProvider | string;
 
-export type ThinkingLevel = "minimal" | "low" | "medium" | "high" | "xhigh";
+export type ThinkingLevel = "minimal" | "low" | "medium" | "high" | "xhigh" | "max";
 export type ModelThinkingLevel = "off" | ThinkingLevel;
 export type ThinkingLevelMap = Partial<Record<ModelThinkingLevel, string | null>>;
 export type ChatTemplateKwargValue =

packages/ai/test/codex-websocket-cached-probe.ts

@@ -19,7 +19,7 @@ import {
 import { getModel } from "../src/compat.ts";
 import type { AssistantMessage, Context, Message, Model, Tool, ToolResultMessage, Transport } from "../src/types.ts";
 
-type ThinkingLevel = "minimal" | "low" | "medium" | "high" | "xhigh";
+type ThinkingLevel = "minimal" | "low" | "medium" | "high" | "xhigh" | "max";
 
 interface Args {
 	turns: number;
@@ -58,7 +58,14 @@ function parseArgs(argv: string[]): Args {
 				break;
 			case "--reasoning": {
 				const value = required(argv[++i], arg);
-				if (value !== "minimal" && value !== "low" && value !== "medium" && value !== "high" && value !== "xhigh") {
+				if (
+					value !== "minimal" &&
+					value !== "low" &&
+					value !== "medium" &&
+					value !== "high" &&
+					value !== "xhigh" &&
+					value !== "max"
+				) {
 					throw new Error(`Invalid --reasoning: ${value}`);
 				}
 				reasoning = value;
@@ -90,7 +97,7 @@ function printHelp(): void {
 Options:
   --turns <n>          Number of user turns. Default: ${DEFAULT_TURNS}
   --transport <mode>   sse | websocket | websocket-cached | auto. Default: websocket-cached
-  --reasoning <level>  minimal | low | medium | high | xhigh. Default: low
+  --reasoning <level>  minimal | low | medium | high | xhigh | max. Default: low
   --max-tokens <n>     Max output tokens per model request. Default: ${DEFAULT_MAX_TOKENS}
   --session-id <id>    Session id for websocket/cache state
 `);

packages/ai/test/github-copilot-anthropic.test.ts

@@ -57,12 +57,14 @@ describe("Copilot Claude via Anthropic Messages", () => {
 
 	it("applies Copilot-specific adaptive thinking effort overrides", () => {
 		const opus47 = getModel("github-copilot", "claude-opus-4.7");
-		expect(opus47.thinkingLevelMap).toMatchObject({ minimal: "low", xhigh: "xhigh" });
+		expect(opus47.thinkingLevelMap).toMatchObject({ minimal: "low", xhigh: "xhigh", max: "max" });
 		expect(getSupportedThinkingLevels(opus47)).toContain("xhigh");
+		expect(getSupportedThinkingLevels(opus47)).toContain("max");
 
 		const sonnet46 = getModel("github-copilot", "claude-sonnet-4.6");
-		expect(sonnet46.thinkingLevelMap).toMatchObject({ minimal: "low", xhigh: "max" });
-		expect(getSupportedThinkingLevels(sonnet46)).toContain("xhigh");
+		expect(sonnet46.thinkingLevelMap).toMatchObject({ minimal: "low", max: "max" });
+		expect(getSupportedThinkingLevels(sonnet46)).toContain("max");
+		expect(getSupportedThinkingLevels(sonnet46)).not.toContain("xhigh");
 	});
 
 	it("uses Bearer auth, Copilot headers, and valid Anthropic Messages payload", async () => {

packages/ai/test/max-thinking.test.ts

@@ -0,0 +1,89 @@
+import { describe, expect, it } from "vitest";
+import { streamSimple as streamSimpleOpenAICodexResponses } from "../src/api/openai-codex-responses.ts";
+import { clampThinkingLevel, getModel, getSupportedThinkingLevels } from "../src/compat.ts";
+import type { Context, Model } from "../src/types.ts";
+
+function mockToken(): string {
+	const payload = Buffer.from(
+		JSON.stringify({ "https://api.openai.com/auth": { chatgpt_account_id: "acc_test" } }),
+		"utf8",
+	).toString("base64");
+	return `aaa.${payload}.bbb`;
+}
+
+describe("max thinking level", () => {
+	it("is opt-in for ordinary reasoning models", () => {
+		const model: Model<"openai-completions"> = {
+			id: "ordinary-reasoning",
+			name: "Ordinary Reasoning",
+			api: "openai-completions",
+			provider: "test",
+			baseUrl: "https://example.com/v1",
+			reasoning: true,
+			input: ["text"],
+			cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
+			contextWindow: 128000,
+			maxTokens: 4096,
+		};
+
+		expect(getSupportedThinkingLevels(model)).toEqual(["off", "minimal", "low", "medium", "high"]);
+		expect(clampThinkingLevel(model, "max")).toBe("high");
+	});
+
+	it.each(["gpt-5.6-luna", "gpt-5.6-sol", "gpt-5.6-terra"] as const)(
+		"exposes xhigh and max for openai-codex/%s",
+		(modelId) => {
+			const model = getModel("openai-codex", modelId);
+			expect(model).toBeDefined();
+			expect(model?.thinkingLevelMap).toMatchObject({ xhigh: "xhigh", max: "max" });
+			expect(getSupportedThinkingLevels(model!)).toEqual([
+				"off",
+				"minimal",
+				"low",
+				"medium",
+				"high",
+				"xhigh",
+				"max",
+			]);
+		},
+	);
+
+	it("supports a hole between high and max", () => {
+		const model: Model<"openai-completions"> = {
+			id: "high-and-max",
+			name: "High and Max",
+			api: "openai-completions",
+			provider: "test",
+			baseUrl: "https://example.com/v1",
+			reasoning: true,
+			thinkingLevelMap: { xhigh: null, max: "max" },
+			input: ["text"],
+			cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
+			contextWindow: 128000,
+			maxTokens: 4096,
+		};
+
+		expect(getSupportedThinkingLevels(model)).toEqual(["off", "minimal", "low", "medium", "high", "max"]);
+		expect(clampThinkingLevel(model, "xhigh")).toBe("max");
+	});
+
+	it("sends max to the Codex Responses API", async () => {
+		const model = getModel("openai-codex", "gpt-5.6-sol")!;
+		const context: Context = {
+			systemPrompt: "You are a helpful assistant.",
+			messages: [{ role: "user", content: "Hello", timestamp: Date.now() }],
+		};
+		let payload: unknown;
+
+		await streamSimpleOpenAICodexResponses(model, context, {
+			apiKey: mockToken(),
+			reasoning: "max",
+			onPayload: (request) => {
+				payload = request;
+				throw new Error("payload captured");
+			},
+		}).result();
+
+		expect(payload).toMatchObject({ reasoning: { effort: "max", summary: "auto" } });
+	});
+});

packages/ai/test/openai-completions-tool-choice.test.ts

@@ -305,7 +305,7 @@ describe("openai-completions tool_choice", () => {
 				low: "high",
 				medium: "high",
 				high: "high",
-				xhigh: "max",
+				max: "max",
 			});
 		}
 	});
@@ -316,7 +316,7 @@ describe("openai-completions tool_choice", () => {
 			{ reasoning: "low", effort: "high" },
 			{ reasoning: "medium", effort: "high" },
 			{ reasoning: "high", effort: "high" },
-			{ reasoning: "xhigh", effort: "max" },
+			{ reasoning: "max", effort: "max" },
 		] as const;
 
 		for (const testCase of cases) {

packages/ai/test/supports-xhigh.test.ts

@@ -2,35 +2,47 @@ import { describe, expect, it } from "vitest";
 import { getModel, getSupportedThinkingLevels } from "../src/compat.ts";
 
 describe("getSupportedThinkingLevels", () => {
-	it("includes xhigh for Anthropic Opus 4.6 on anthropic-messages API", () => {
+	it("includes max but not xhigh for Anthropic Opus 4.6 on anthropic-messages API", () => {
 		const model = getModel("anthropic", "claude-opus-4-6");
 		expect(model).toBeDefined();
-		expect(getSupportedThinkingLevels(model!)).toContain("xhigh");
+		expect(getSupportedThinkingLevels(model!)).toContain("max");
+		expect(getSupportedThinkingLevels(model!)).not.toContain("xhigh");
 	});
 
-	it("includes xhigh for Anthropic Opus 4.8 on anthropic-messages API", () => {
+	it("includes xhigh and max for Anthropic Opus 4.8 on anthropic-messages API", () => {
 		const model = getModel("anthropic", "claude-opus-4-8");
 		expect(model).toBeDefined();
 		expect(getSupportedThinkingLevels(model!)).toContain("xhigh");
+		expect(getSupportedThinkingLevels(model!)).toContain("max");
 	});
 
-	it("includes xhigh for Anthropic Opus 4.8 on anthropic-messages API", () => {
-		const model = getModel("anthropic", "claude-opus-4-8");
+	it("includes max but not xhigh for Anthropic Sonnet 4.6 on anthropic-messages API", () => {
+		const model = getModel("anthropic", "claude-sonnet-4-6");
+		expect(model).toBeDefined();
+		expect(getSupportedThinkingLevels(model!)).toContain("max");
+		expect(getSupportedThinkingLevels(model!)).not.toContain("xhigh");
+	});
+
+	it("includes xhigh and max for Anthropic Sonnet 5 on anthropic-messages API", () => {
+		const model = getModel("anthropic", "claude-sonnet-5");
 		expect(model).toBeDefined();
 		expect(getSupportedThinkingLevels(model!)).toContain("xhigh");
+		expect(getSupportedThinkingLevels(model!)).toContain("max");
 	});
 
-	it("includes xhigh but not off for Anthropic Claude Fable 5 on anthropic-messages API", () => {
+	it("includes xhigh and max but not off for Anthropic Claude Fable 5 on anthropic-messages API", () => {
 		const model = getModel("anthropic", "claude-fable-5");
 		expect(model).toBeDefined();
 		expect(getSupportedThinkingLevels(model!)).toContain("xhigh");
+		expect(getSupportedThinkingLevels(model!)).toContain("max");
 		expect(getSupportedThinkingLevels(model!)).not.toContain("off");
 	});
 
-	it("does not include xhigh for Claude Sonnet 4.5", () => {
+	it("does not include xhigh or max for Claude Sonnet 4.5", () => {
 		const model = getModel("anthropic", "claude-sonnet-4-5");
 		expect(model).toBeDefined();
 		expect(getSupportedThinkingLevels(model!)).not.toContain("xhigh");
+		expect(getSupportedThinkingLevels(model!)).not.toContain("max");
 	});
 
 	it.each(["gpt-5.4", "gpt-5.5", "gpt-5.6-sol", "gpt-5.6-terra", "gpt-5.6-luna"] as const)(
@@ -43,11 +55,19 @@ describe("getSupportedThinkingLevels", () => {
 	);
 
 	it.each(["gpt-5.6", "gpt-5.6-sol", "gpt-5.6-terra", "gpt-5.6-luna"] as const)(
-		"includes xhigh for OpenAI %s models",
+		"includes xhigh and max for OpenAI %s models",
 		(modelId) => {
 			const model = getModel("openai", modelId);
 			expect(model).toBeDefined();
-			expect(getSupportedThinkingLevels(model!)).toContain("xhigh");
+			expect(getSupportedThinkingLevels(model!)).toEqual([
+				"off",
+				"minimal",
+				"low",
+				"medium",
+				"high",
+				"xhigh",
+				"max",
+			]);
 		},
 	);
 
@@ -63,16 +83,16 @@ describe("getSupportedThinkingLevels", () => {
 		expect(getSupportedThinkingLevels(model!)).toEqual(["medium", "high", "xhigh"]);
 	});
 
-	it("includes only high/xhigh plus off for DeepSeek V4 Flash on the DeepSeek provider", () => {
+	it("includes only high/max plus off for DeepSeek V4 Flash on the DeepSeek provider", () => {
 		const model = getModel("deepseek", "deepseek-v4-flash");
 		expect(model).toBeDefined();
-		expect(getSupportedThinkingLevels(model!)).toEqual(["off", "high", "xhigh"]);
+		expect(getSupportedThinkingLevels(model!)).toEqual(["off", "high", "max"]);
 	});
 
-	it("includes only high/xhigh plus off for DeepSeek V4 Flash on opencode-go", () => {
+	it("includes only high/max plus off for DeepSeek V4 Flash on opencode-go", () => {
 		const model = getModel("opencode-go", "deepseek-v4-flash");
 		expect(model).toBeDefined();
-		expect(getSupportedThinkingLevels(model!)).toEqual(["off", "high", "xhigh"]);
+		expect(getSupportedThinkingLevels(model!)).toEqual(["off", "high", "max"]);
 	});
 
 	it("includes only high plus off for OpenCode Go Kimi K2.6", () => {
@@ -102,16 +122,18 @@ describe("getSupportedThinkingLevels", () => {
 		expect(getSupportedThinkingLevels(model!)).toEqual(["off", "high", "xhigh"]);
 	});
 
-	it("includes xhigh for OpenRouter Opus 4.6 (openai-completions API)", () => {
+	it("includes max but not xhigh for OpenRouter Opus 4.6 (openai-completions API)", () => {
 		const model = getModel("openrouter", "anthropic/claude-opus-4.6");
 		expect(model).toBeDefined();
-		expect(getSupportedThinkingLevels(model!)).toContain("xhigh");
+		expect(getSupportedThinkingLevels(model!)).toContain("max");
+		expect(getSupportedThinkingLevels(model!)).not.toContain("xhigh");
 	});
 
-	it("includes xhigh but not off for Bedrock Claude Fable 5", () => {
+	it("includes xhigh and max but not off for Bedrock Claude Fable 5", () => {
 		const model = getModel("amazon-bedrock", "global.anthropic.claude-fable-5");
 		expect(model).toBeDefined();
 		expect(getSupportedThinkingLevels(model!)).toContain("xhigh");
+		expect(getSupportedThinkingLevels(model!)).toContain("max");
 		expect(getSupportedThinkingLevels(model!)).not.toContain("off");
 	});
 });