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Anthropic · model release

Claude Opus 5.5

Anthropic releases Opus 5.5, a Claude model it says matches Fable 5.1 on most work at lower cost.

In detail

Anthropic released Claude Opus 5.5, the first model in its Claude 5.5 family, on all platforms. It said the model performs at the level of Claude Fable 5.1 on most work and costs 40% less to run than Claude Opus 5.

Sources

  1. Introducing Claude Opus 5.5 · Anthropic · Primary source
  2. Claude Developer Platform release notes · Anthropic · Primary source

Last checked 11 November 2026.

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