diff --git a/src/provider.test.ts b/src/provider.test.ts
index b576f1f..46869d2 100644
--- a/src/provider.test.ts
+++ b/src/provider.test.ts
@@ -100,5 +100,17 @@ describe('GitHubModelsProvider', () => {
         }),
       )
     })
+
+    it('should enable structured outputs for chat models', () => {
+      const provider = createGitHubModels()
+      provider('gpt-4')
+
+      expect(OpenAICompatibleChatLanguageModelMock).toHaveBeenCalledWith(
+        'gpt-4',
+        expect.objectContaining({
+          supportsStructuredOutputs: true,
+        }),
+      )
+    })
   })
 })
diff --git a/src/provider.ts b/src/provider.ts
index 2397788..937d17e 100644
--- a/src/provider.ts
+++ b/src/provider.ts
@@ -66,6 +66,7 @@ export function createGitHubModels(options: GitHubModelsProviderOptions = {}): G
     headers: getHeaders,
     fetch: options.fetch,
     includeUsage: true,
+    supportsStructuredOutputs: true,
   } satisfies OpenAICompatibleChatConfig
 
   const createModel = (modelId: GitHubModelsChatModelId) => new OpenAICompatibleChatLanguageModel(modelId, baseOptions)