fix(ai): expose OpenCode Go GLM-5.2 xhigh effort

closes #5967

packages/ai/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Fixed
+
+- Fixed OpenCode Go GLM-5.2 metadata to expose `xhigh` reasoning and send `reasoning_effort: "max"` ([#5967](https://github.com/earendil-works/pi/issues/5967)).
+
 ## [0.79.10] - 2026-06-22
 
 ### Fixed

packages/ai/scripts/generate-models.ts

@@ -164,6 +164,14 @@ const ZAI_GLM52_THINKING_LEVEL_MAP = {
 	high: "high",
 	xhigh: "max",
 } as const;
+const OPENCODE_GO_GLM52_THINKING_LEVEL_MAP = {
+	off: null,
+	minimal: null,
+	low: null,
+	medium: null,
+	high: "high",
+	xhigh: "max",
+} as const;
 const EAGER_TOOL_INPUT_STREAMING_UNSUPPORTED_ANTHROPIC_MODELS = new Set([
 	"github-copilot:claude-haiku-4.5",
 	"github-copilot:claude-sonnet-4",
@@ -380,6 +388,9 @@ function applyThinkingLevelMetadata(model: Model<any>): void {
 	if (model.provider === "fireworks" && model.id === "accounts/fireworks/models/glm-5p2") {
 		mergeThinkingLevelMap(model, { off: "none", minimal: null, low: "high", medium: "high", xhigh: "max" });
 	}
+	if (model.provider === "opencode-go" && model.id === "glm-5.2") {
+		mergeThinkingLevelMap(model, OPENCODE_GO_GLM52_THINKING_LEVEL_MAP);
+	}
 	if (model.provider === "opencode-go" && model.id === "kimi-k2.6") {
 		// OpenCode Go exposes Kimi K2.6 thinking as on/off, not distinct effort tiers.
 		mergeThinkingLevelMap(model, { minimal: null, low: null, medium: null });

packages/ai/src/models.generated.ts

@@ -8594,6 +8594,7 @@ export const MODELS = {
 			baseUrl: "https://opencode.ai/zen/go/v1",
 			compat: {"maxTokensField":"max_tokens"},
 			reasoning: true,
+			thinkingLevelMap: {"off":null,"minimal":null,"low":null,"medium":null,"high":"high","xhigh":"max"},
 			input: ["text"],
 			cost: {
 				input: 1.4,