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OpenAI Fast mode supports long-context requests for GPT-5.6 models

UpdateVerifiedAdded Sep 22, 2026

Prompts over 272K tokens can now run in Fast mode on GPT-5.6 Sol, Terra and Luna, at up to 2.5x the speed of the Standard tier.

Read OpenAI's release notes

https://developers.openai.com/api/docs/changelog#aug-5

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