[Update] Default LLM (#3587)

tests/llms/test_azure_openai_structured.py

@@ -56,7 +56,7 @@ def test_init_with_default_credential(mock_credential, mock_token_provider, mock
     mock_token_provider.return_value = "token-provider"
     llm = AzureOpenAIStructuredLLM(config)
     # Should set default model if not provided
-    assert llm.config.model == "gpt-4o-2024-08-06"
+    assert llm.config.model == "gpt-4.1-nano-2025-04-14"
     mock_credential.assert_called_once()
     mock_token_provider.assert_called_once_with(mock_credential.return_value, SCOPE)
     mock_azure_openai.assert_called_once()
@@ -91,7 +91,7 @@ def test_init_with_placeholder_api_key_uses_default_credential(
         config = DummyConfig(model=None, azure_kwargs=DummyAzureKwargs(api_key="your-api-key"))
         mock_token_provider.return_value = "token-provider"
         llm = AzureOpenAIStructuredLLM(config)
-        assert llm.config.model == "gpt-4o-2024-08-06"
+        assert llm.config.model == "gpt-4.1-nano-2025-04-14"
         mock_credential.assert_called_once()
         mock_token_provider.assert_called_once_with(mock_credential.return_value, SCOPE)
         mock_azure_openai.assert_called_once()