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HomeDocsClaude Code CLI 2 Nov 2026
One change · claude-code

Speed up responses with fast mode changedfast-mode

Nearest release: v2.1.317, published 4 hours after upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

Upstream edited this page at 2 Nov 2026 19:02 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 2 Nov 2026 19:07 UTC.

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First seen 14 Aug 2026 this site's first read of the page
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1111Fast mode is not a different model. It uses Claude Opus with a different API configuration that prioritizes speed over cost efficiency. You get identical quality and capabilities with faster responses. Fast mode is supported on Opus 5.5, Opus 5, and Opus 4.8. It is not available on Sonnet, Haiku, or other models.
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13> [!WARNING]
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15> Fast mode for Opus 4.8 was deprecated on October 30, 2026, and will be removed on November 30, 2026. If Opus 4.8 is still your model with fast mode on after that date, the API rejects your requests. By that date, switch to Opus 5.5 or turn fast mode off in your session:
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17> * **To keep fast mode**: use [`/model`](https://code.claude.com/docs/en/model-config#setting-your-model) to switch to [Opus 5.5](https://code.claude.com/docs/en/model-config.md#model-aliases), which requires Claude Code v2.1.280 or later. Fast mode stays on after the switch. If a new session still starts on Opus 4.8, see [A new session starts on a different model than you picked](https://code.claude.com/docs/en/model-config.md#a-new-session-starts-on-a-different-model-than-you-picked).
18> * **To stay on Opus 4.8 at standard speed**: run [`/fast off`](https://code.claude.com/docs/en/commands)
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1320Opus 4.7 doesn't support fast mode, so switching to it turns fast mode off. Fast mode for Opus 4.7 was deprecated on June 25, 2026, and removed on July 24, 2026.
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1522What to know:
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