fast-mode changedbuild-with-claude/fast-mode
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689689Fast mode is available only on the following models. If you were using fast mode on an earlier model, [migrate to a model that supports fast mode](https://platform.claude.com/docs/en/models/opus-5-5/migration-guide).
690690
691To access fast mode on Claude Opus 5 or Claude Opus 4.8, contact your account manager or [join the waitlist](https://claude.com/fast-mode).
691To access fast mode on Claude Opus 5, contact your account manager or [join the waitlist](https://claude.com/fast-mode).
692
693<Warning>
694 Fast mode on Claude Opus 4.8 is deprecated and will be removed on November 30, 2026. After removal, requests to `claude-opus-4-8` with `speed: "fast"` will return an error. To continue using fast mode, migrate to Claude Opus 5.5. See [Migrating to Claude Opus 5.5 from Claude Opus 4.8](https://platform.claude.com/docs/en/models/opus-5-5/migration-guide#migrating-from-claude-opus-4-8).
695</Warning>
692696
693697#### [Messages API](https://platform.claude.com/docs/en/build-with-claude/working-with-messages)
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