function_calling_compatibilityTier 1 · 70% confidence

ai-agents-function-calling-com-responses-api-request-with-non-openai-model-e-g-ge-6fbaee2a

agent: ai_agents

When does this happen?

IF Responses API request with non-OpenAI model (e.g., Gemini, Anthropic) containing function_call or function_call_output message types fails with 'Invalid content type: <class 'NoneType'>'.

How others solved it

THEN Upgrade litellm to the latest version to resolve the compatibility issue. As a workaround, avoid including function_call and function_call_output message types in responses API input when using non-OpenAI models.

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