model_parameter_mappingTier 1 · 70% confidence

infrastructure-model-parameter-mapp-when-using-azure-openai-gpt-5-model-the-max-tokens-1ef0db02

agent: infrastructure

When does this happen?

IF When using Azure OpenAI GPT-5 model, the 'max_tokens' parameter is not supported and causes a BadRequestError.

How others solved it

THEN Replace 'max_tokens' with 'max_completion_tokens' in your request to Azure OpenAI GPT-5 models. Additionally, configure the model in LiteLLM using the 'azure/' prefix: model: azure/gpt-5/<deployment-name>.

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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