fix(ai): exclude nonexistent GPT-5.6 alias

packages/ai/scripts/generate-models.ts

@@ -193,6 +193,8 @@ const ANT_LING_RING_THINKING_LEVEL_MAP = {
 	xhigh: "xhigh",
 } as const;
 
+const MODELS_DEV_OPENAI_UNSUPPORTED_MODEL_IDS = new Set(["gpt-5.6"]);
+
 const OPENAI_RESPONSES_NONE_REASONING_MODELS = new Set([
 	"gpt-5.1",
 	"gpt-5.2",
@@ -201,7 +203,6 @@ const OPENAI_RESPONSES_NONE_REASONING_MODELS = new Set([
 	"gpt-5.4-mini",
 	"gpt-5.4-nano",
 	"gpt-5.5",
-	"gpt-5.6",
 	"gpt-5.6-sol",
 	"gpt-5.6-terra",
 	"gpt-5.6-luna",
@@ -905,6 +906,8 @@ async function loadModelsDevData(): Promise<Model<any>[]> {
 			for (const [modelId, model] of Object.entries(data.openai.models)) {
 				const m = model as ModelsDevModel;
 				if (m.tool_call !== true) continue;
+				// models.dev lists this alias, but it is not accepted by OpenAI APIs.
+				if (MODELS_DEV_OPENAI_UNSUPPORTED_MODEL_IDS.has(modelId)) continue;
 
 				models.push({
 					id: modelId,
@@ -1713,18 +1716,6 @@ async function generateModels() {
 
 	// Add missing gpt models
 	const missingOpenAiModels: Model<"openai-responses">[] = [
-		{
-			id: "gpt-5.6",
-			name: "GPT-5.6",
-			api: "openai-responses",
-			baseUrl: "https://api.openai.com/v1",
-			provider: "openai",
-			reasoning: true,
-			input: ["text", "image"],
-			cost: { input: 5, output: 30, cacheRead: 0.5, cacheWrite: 0 },
-			contextWindow: 1050000,
-			maxTokens: 128000,
-		},
 		{
 			id: "gpt-5.6-sol",
 			name: "GPT-5.6 Sol",

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

@@ -606,24 +606,6 @@ export const AZURE_OPENAI_RESPONSES_MODELS = {
 		contextWindow: 1050000,
 		maxTokens: 128000,
 	} satisfies Model<"azure-openai-responses">,
-	"gpt-5.6": {
-		id: "gpt-5.6",
-		name: "GPT-5.6",
-		api: "azure-openai-responses",
-		provider: "azure-openai-responses",
-		baseUrl: "",
-		reasoning: true,
-		thinkingLevelMap: {"off":null,"xhigh":"xhigh","max":"max"},
-		input: ["text", "image"],
-		cost: {
-			input: 5,
-			output: 30,
-			cacheRead: 0.5,
-			cacheWrite: 6.25,
-		},
-		contextWindow: 1050000,
-		maxTokens: 128000,
-	} satisfies Model<"azure-openai-responses">,
 	"gpt-5.6-luna": {
 		id: "gpt-5.6-luna",
 		name: "GPT-5.6 Luna",

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

@@ -606,24 +606,6 @@ export const OPENAI_MODELS = {
 		contextWindow: 1050000,
 		maxTokens: 128000,
 	} satisfies Model<"openai-responses">,
-	"gpt-5.6": {
-		id: "gpt-5.6",
-		name: "GPT-5.6",
-		api: "openai-responses",
-		provider: "openai",
-		baseUrl: "https://api.openai.com/v1",
-		reasoning: true,
-		thinkingLevelMap: {"off":"none","xhigh":"xhigh","max":"max"},
-		input: ["text", "image"],
-		cost: {
-			input: 5,
-			output: 30,
-			cacheRead: 0.5,
-			cacheWrite: 6.25,
-		},
-		contextWindow: 1050000,
-		maxTokens: 128000,
-	} satisfies Model<"openai-responses">,
 	"gpt-5.6-luna": {
 		id: "gpt-5.6-luna",
 		name: "GPT-5.6 Luna",

packages/ai/test/openai-responses-copilot-provider.test.ts

@@ -99,7 +99,6 @@ describe("openai-responses provider defaults", () => {
 		"gpt-5.4-mini",
 		"gpt-5.4-nano",
 		"gpt-5.5",
-		"gpt-5.6",
 		"gpt-5.6-sol",
 		"gpt-5.6-terra",
 		"gpt-5.6-luna",

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

@@ -54,7 +54,7 @@ describe("getSupportedThinkingLevels", () => {
 		},
 	);
 
-	it.each(["gpt-5.6", "gpt-5.6-sol", "gpt-5.6-terra", "gpt-5.6-luna"] as const)(
+	it.each(["gpt-5.6-sol", "gpt-5.6-terra", "gpt-5.6-luna"] as const)(
 		"includes xhigh and max for OpenAI %s models",
 		(modelId) => {
 			const model = getModel("openai", modelId);