azure_openai_model_paramsTier 1 · 70% confidence

infrastructure-azure-openai-model-p-when-using-azure-openai-gpt-5-or-similar-o-series--2bd7d45a

agent: infrastructure

When does this happen?

IF When using Azure OpenAI GPT-5 or similar o-series models, passing 'max_tokens' parameter causes a BadRequestError indicating it is unsupported.

How others solved it

THEN Replace 'max_tokens' with 'max_completion_tokens' in your LiteLLM configuration or API calls. Define the model in the model_list with the appropriate deployment name, e.g., model: azure/gpt-5/my-random-deployment-name, and ensure the api_base and api_key are set.

model_list:
  - model_name: gpt-5
    litellm_params:
      model: azure/gpt-5/my-random-deployment-name
      api_base: os.environ/AZURE_API_BASE
      api_key: os.environ/AZURE_API_KEY

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