Anthropic releases Claude Opus 5.5, then Sonnet and Haiku 5.5
Anthropic launched Claude Opus 5.5 on September 22, saying it is faster, writes more clearly and costs about 40% less to run than its previous top model.
September 22, 2026 · Launch
Anthropic launched Claude Opus 5.5 on September 22, saying it is faster, writes more clearly and costs about 40% less to run than its previous top model. Sonnet 5.5 followed on September 28 and Haiku 5.5 on October 7.
Why it matters to you: Faster, cheaper models usually show up as better answers and higher usage limits in the apps people use.
Source: Anthropic: Opus 5.5, Sonnet 5.5, Haiku 5.5
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