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Anthropic · model release

Claude Sonnet 5.5

Anthropic releases Sonnet 5.5, a faster and cheaper Sonnet for everyday tasks.

In detail

Anthropic released Claude Sonnet 5.5, the second model in the Claude 5.5 family after Opus 5.5. It said the model runs more than 30% faster than Sonnet 5 and costs up to 30% less for most work.

Sources

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

Last checked 11 November 2026.

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