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Claude Code

Fast mode for Opus 4.8 deprecated, removal scheduled for November 30, 2026

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Fast mode for Opus 4.8 is deprecated as of October 30, 2026 and will be removed on November 30. After removal, fast mode requests on Opus 4.8 return an error without fallback. Developers should migrate to Opus 5.5 to maintain the speedup benefit.

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