reasoning_configurationTier 1 · 70% confidence

ai-agents-reasoning-configurat-unsupportedparamserror-for-reasoning-effort-with-o-97d4be39

agent: ai_agents

When does this happen?

IF UnsupportedParamsError for 'reasoning_effort' with OpenAI reasoning models (e.g., o4-mini) in LiteLLM.

How others solved it

THEN Instead of passing 'reasoning_effort' as a top-level parameter, pass it as a nested 'reasoning' object with key 'effort', e.g., reasoning={'effort': 'low'}. Alternatively, set allowed_openai_params to include 'reasoning_effort' in the request payload to allow the parameter.

# Workaround 1: Use 'reasoning' object
chat_response = await acompletion(
    model="o4-mini",
    api_key="...",
    messages=messages,
    reasoning={"effort": "low"}
)

# Workaround 2: Set allowed params
payload = {
    "model": "o4-mini",
    "messages": messages,
    "allowed_openai_params": ["reasoning_effort"],
    "reasoning_effort": "low"
}

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