anthropic: Deprecate fast mode for Opus 4.6 and Opus 4.7 - #61341
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tomhoule merged 2 commits intoJul 20, 2026
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…ies#61341) TLDR: Opus 4.6 has been falling back to standard speed. Opus 4.7 fast mode API will error after July 24th. This will likely need to be cherry-picked to stable for either Wednesday's release, or be pushed out separately on the 24th to maximize availability. Although I don't think there are many Opus 4.7 fast mode users, so Wednesday seems better to me. > Fast mode for Claude Opus 4.7 is deprecated as of June 25, 2026, and will be removed on July 24, 2026. After removal, requests to claude-opus-4-7 with speed: "fast" will return an error; unlike Claude Opus 4.6 (see the following note), Claude Opus 4.7 does not fall back to standard speed. The model itself remains available at standard speed. To continue using fast mode, migrate to Claude Opus 4.8. Source: https://platform.claude.com/docs/en/build-with-claude/fast-mode Release Notes: - Deprecated Fast Mode for Opus 4.6 and Opus 4.7
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…ies#61341) TLDR: Opus 4.6 has been falling back to standard speed. Opus 4.7 fast mode API will error after July 24th. This will likely need to be cherry-picked to stable for either Wednesday's release, or be pushed out separately on the 24th to maximize availability. Although I don't think there are many Opus 4.7 fast mode users, so Wednesday seems better to me. > Fast mode for Claude Opus 4.7 is deprecated as of June 25, 2026, and will be removed on July 24, 2026. After removal, requests to claude-opus-4-7 with speed: "fast" will return an error; unlike Claude Opus 4.6 (see the following note), Claude Opus 4.7 does not fall back to standard speed. The model itself remains available at standard speed. To continue using fast mode, migrate to Claude Opus 4.8. Source: https://platform.claude.com/docs/en/build-with-claude/fast-mode Release Notes: - Deprecated Fast Mode for Opus 4.6 and Opus 4.7
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TLDR: Opus 4.6 has been falling back to standard speed. Opus 4.7 fast mode API will error after July 24th.
This will likely need to be cherry-picked to stable for either Wednesday's release, or be pushed out separately on the 24th to maximize availability. Although I don't think there are many Opus 4.7 fast mode users, so Wednesday seems better to me.
Source: https://platform.claude.com/docs/en/build-with-claude/fast-mode
Release Notes: