@@ -915,11 +915,35 @@ export namespace Provider {
             }
           : undefined,
       },
-      limit: {
-        context: model.limit.context,
-        input: model.limit.input,
-        output: model.limit.output,
-      },
+      limit: iife(() => {
+        // models.dev has incorrect context/output limits for GitHub Copilot Claude models.
+        // Override with the correct values from Anthropic's official documentation.
+        // See: https://platform.claude.com/docs/en/about-claude/models/overview
+        if (provider.id === "github-copilot" && model.id.includes("claude")) {
+          const COPILOT_CLAUDE_LIMITS: Record<string, { context: number; output: number }> = {
+            "claude-opus-4.6":   { context: 1_000_000, output: 128_000 },
+            "claude-sonnet-4.6": { context: 1_000_000, output:  64_000 },
+            "claude-haiku-4.5":  { context:   200_000, output:  64_000 },
+            "claude-opus-4.5":   { context:   200_000, output:  32_000 },
+            "claude-sonnet-4.5": { context:   200_000, output:  64_000 },
+            "claude-sonnet-4":   { context:   200_000, output:  16_000 },
+            "claude-opus-41":    { context:   200_000, output:  32_000 },
+          }
+          const override = COPILOT_CLAUDE_LIMITS[model.id]
+          if (override) {
+            return {
+              context: override.context,
+              input: model.limit.input,
+              output: override.output,
+            }
+          }
+        }
+        return {
+          context: model.limit.context,
+          input: model.limit.input,
+          output: model.limit.output,
+        }
+      }),
       capabilities: {
         temperature: model.temperature,
         reasoning: model.reasoning,
 
@@ -464,8 +464,17 @@ export namespace ProviderTransform {
           return {}
         }
         if (model.id.includes("claude")) {
+          if (isAnthropicAdaptive) {
+            return {
+              low:    { thinking_budget: 1024 },
+              medium: { thinking_budget: 8000 },
+              high:   { thinking_budget: 16000 },
+              max:    { thinking_budget: 31999 },
+            }
+          }
           return {
-            thinking: { thinking_budget: 4000 },
+            high: { thinking_budget: 8000 },
+            max:  { thinking_budget: 16000 },
           }
         }
         const copilotEfforts = iife(() => {
Original file line number	Diff line number	Diff line change
`@@ -464,8 +464,17 @@ export namespace ProviderTransform {`
`464`	`464`	`return {}`
`465`	`465`	`}`
`466`	`466`	`if (model.id.includes("claude")) {`
	`467`	`+ if (isAnthropicAdaptive) {`
	`468`	`+ return {`
	`469`	`+ low: { thinking_budget: 1024 },`
	`470`	`+ medium: { thinking_budget: 8000 },`
	`471`	`+ high: { thinking_budget: 16000 },`
	`472`	`+ max: { thinking_budget: 31999 },`
	`473`	`+ }`
	`474`	`+ }`
`467`	`475`	`return {`
`468`		`- thinking: { thinking_budget: 4000 },`
	`476`	`+ high: { thinking_budget: 8000 },`
	`477`	`+ max: { thinking_budget: 16000 },`
`469`	`478`	`}`
`470`	`479`	`}`
`471`	`480`	`const copilotEfforts = iife(() => {`