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Phoenix now supports selecting the OpenAI API type for OpenAI and Azure OpenAI calls in the Playground and custom providers. Key capabilities:
  • API type selection: Choose Chat Completions (chat.completions.create) or Responses (responses.create) per model configuration.
  • Custom provider support: OpenAI and Azure OpenAI custom providers can be configured with an API type for consistent routing.
  • Parameter compatibility: Phoenix maps shared invocation parameters to the chosen API type and filters unsupported fields automatically.
To get started, open the model configuration panel in the Playground and select an OpenAI API type. For server-managed setups, configure the API type in Settings → AI Providers → Custom Providers.