fix(ai): relax xhigh model check

fixes #1209

packages/ai/src/models.ts

@@ -45,15 +45,12 @@ export function calculateCost<TApi extends Api>(model: Model<TApi>, usage: Usage
 	return usage.cost;
 }
 
-/** Models that support xhigh thinking level */
-const XHIGH_MODELS = new Set(["gpt-5.1-codex-max", "gpt-5.2", "gpt-5.2-codex"]);
-
 /**
  * Check if a model supports xhigh thinking level.
  * Currently only certain OpenAI Codex models support this.
  */
 export function supportsXhigh<TApi extends Api>(model: Model<TApi>): boolean {
-	return XHIGH_MODELS.has(model.id);
+	return model.id.includes("gpt-5.2");
 }
 
 /**