test_chat_completions_api_uses_model_name() — langchain Function Reference

Source Code

libs/partners/openai/tests/unit_tests/chat_models/test_azure.py lines 125–142

def test_chat_completions_api_uses_model_name() -> None:
    """Test that regular Chat Completions API still uses model name."""
    llm = AzureChatOpenAI(
        azure_deployment="your_deployment",
        model="gpt-5",  # This is the OpenAI model name
        api_version="2025-04-01-preview",
        azure_endpoint="your_endpoint",
        api_key=SecretStr("your_api_key"),
        # No Responses-only parameters, so Chat Completions API will be used
    )
    messages = [HumanMessage("Hello")]
    payload = llm._get_request_payload(messages)

    # For Chat Completions API, the model field should still be None/model_name
    # Azure Chat Completions uses deployment in the URL, not in the model field
    assert payload["model"] == "gpt-5"
    assert "messages" in payload  # Chat Completions API uses 'messages'
    assert "input" not in payload