AI Gateway now supports OpenAI's Ultrafast service tier, providing faster output for interactive applications and rapid coding iterations.

Currently, GPT 6 Astra and GPT 6.1 Sol are supported. To use Ultrafast, request it for openai/gpt-6-astra or openai/gpt-6.1-sol through AI SDK, the Chat Completions API, or Responses API:

For workflows with frequent tool calls, OpenAI recommends the Responses API over a persistent WebSocket connection to reduce overhead between turns. See the Ultrafast service-tier examples for persistent connections, including AI SDK over WebSocket.

Ultrafast supports US and global processing. Requests pinned to unsupported regions, such as the EU, run at the standard ( default ) tier. Standard processing remains the default when no service tier is specified.

Requests served at Ultrafast are billed at 6× the standard per-token rate, while requests that fall back to another tier are billed at the rate for the tier actually served.…