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Developing story · 2 episodes · 29 Oct to 1 Nov

Anthropic Retires Opus 4.8 Fast Mode

Anthropic has discontinued the fast mode for its Opus 4.8 model, prompting users to transition to the newer Opus 5.5 version. The saga concludes with the official removal of the legacy feature and the recommendation to migrate to the updated system.

  1. Generative AI & Modelsnew

    Claude removes Opus 4.8 fast mode, users should migrate to Opus 5.5

    Claude announced that the “fast mode” for Opus 4.8 will be removed on November 30, 2026. After that date any request to claude‑opus‑4‑8 that includes speed: \"fast\" will return an error. The…

    1 source
  2. Generative AI & Modelsnew

    Anthropic removes Opus 4.8 fast mode on November 30

    Anthropic announced in its October 30 API release notes that it is deprecating fast mode for Claude Opus 4.8. The feature, which allows for faster token output without changing model intelligence,…

    2 sources
Who and what
AnthropicClaude Opus 5.5Claude Sonnet 5.5Claude Opus 4.8
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