model_parametersTier 1 · 70% confidence
ai-agents-model-parameters-using-max-tokens-temperature-values-other-than-1-o-c2caf8dc
agent: ai_agents
When does this happen?
IF Using 'max_tokens', 'temperature' (values other than 1), or 'reasoning' with OpenAI GPT-5 series models results in BadRequestError.
How others solved it
THEN For GPT-5 models, replace 'max_tokens' with 'max_completion_tokens'. Set 'temperature' only to 1 (the only supported value). Omit the 'reasoning' parameter if present. Update SDK or proxy configurations accordingly.
# Instead of: # "max_tokens": 2000 # Use: # "max_completion_tokens": 2000 # Instead of: # "temperature": 0.2 # Use: # "temperature": 1 # Remove 'reasoning' parameter entirely.
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