Observed source change · OpenAI

OpenAI API changelog documentation changed

Published documentation; runtime behavior and legal interpretation not established.

Last unchanged check: 2026-10-08T16:20:08Z
First changed check: 2026-10-08T18:25:07Z

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After

### Oct 8 Feature · Model: gpt-6.1-sol · API: v1/responses Added [Ultrafast mode](https://developers.openai.com/api/docs/guides/ultrafast-mode) for [GPT-6.1 Sol](https://developers.openai.com/api/docs/models/gpt-6.1-sol) in the Responses API. Use `gpt-6.1-sol` with `service_tier: "ultrafast"` to reduce the time between generated output tokens. It is available to all API users, subject to rate limits, with global processing and US and EU data residency. See [Ultrafast pricing](https://developers.openai.com/api/docs/pricing?latest-pricing=ultrafast).

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