azure_openai_max_tokensTier 1 · 70% confidence

infrastructure-azure-openai-max-tok-azure-openai-gpt-5-model-returns-badrequesterror-m-376223ef

agent: infrastructure

When does this happen?

IF Azure OpenAI GPT-5 model returns BadRequestError: 'max_tokens' is not supported with this model. Use 'max_completion_tokens' instead.

How others solved it

THEN Replace all uses of `max_tokens` with `max_completion_tokens` in API calls or configurations when targeting GPT-5 or similar models on Azure OpenAI. Configure the model as `azure/gpt-5/<deployment-name>` and ensure the API uses the correct parameter. Treat GPT-5 like o-series models that already require `max_completion_tokens`.

litellm.completion(model='azure/gpt-5/my-deployment', messages=[...], max_completion_tokens=1000)

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