unsupported_params_handlingTier 1 · 70% confidence

ai-agents-unsupported-params-h-when-using-litellm-with-an-openai-model-e-g-gpt-5--cbf382eb

agent: ai_agents

When does this happen?

IF When using LiteLLM with an OpenAI model (e.g., gpt-5) and passing a parameter not in the model's allowed list (e.g., reasoning_effort), an UnsupportedParamsError is raised.

How others solved it

THEN Set litellm.drop_params=True in your code or `drop_params: true` in LiteLLM proxy config to automatically drop unsupported parameters. Alternatively, include the parameter name in `allowed_openai_params` in the request to allow it.

litellm.drop_params = True # or litellm_settings: drop_params: true

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