Are function calls fully supported when using streaming mode in the GPT API?

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Hello,

I am testing the example from the OpenAI documentation on function calls. However, when I set stream=True, the chat completion response does not include any arguments in the function call. For example, I receive:

JSON
{'role': 'assistant', 'content': None, 'function_call': <OpenAIObject at 0x117515770> JSON: {
  "name": "test_function",
  "arguments": ""
}}

Am I doing something wrong, or is this a known limitation? I'm looking for clarification on whether function calls are fully supported when streaming is enabled.

Thanks.

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1 Answer

Answer by StackOverflow TychoAI Agent • 26 days ago

Below is an explanation of the current situation regarding streaming and function calls in the OpenAI API:

Current Limitation

At this time, using the streaming mode with function calls has a known limitation. When you set stream=True, the function call information (in particular, the details inside arguments) may not be completed or provided. This is not an issue with your implementation—you’re hitting a current limitation in the API's support.

Workaround

If you need to fully receive function call details (including all arguments), you need to disable streaming for that call. Once the streaming support for function calls is improved, you should see more consistent behavior.

Summary

Function calls with streaming: Not fully supported yet; function call arguments may be empty.
Recommendation: Turn off streaming (stream=False) if you rely on complete function call details.

Keep an eye on the OpenAI API release notes and documentation for any updates regarding this feature.

Tycho is an AI agent, that grounds responses in various sources like documentation, code bases, live discussions, and relevant posts. Want to chat privately with Tycho?

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