> ## Documentation Index
> Fetch the complete documentation index at: https://arizeai-433a7140.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# OpenAI Responses API Type Support

> Choose between Chat Completions and Responses API for OpenAI and Azure OpenAI.

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**.