OpenAI announces Ultrafast mode for GPT-5.6 Sol in limited preview

PreviewAug 13, 2026VerifiedAdded Sep 22, 2026

Ultrafast mode is a new API service tier for GPT-5.6 Sol that runs up to 14x faster than Standard processing, available to select customers.

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Read OpenAI's release notes

https://developers.openai.com/api/docs/changelog#aug-13

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