Releases
Claude Sonnet 5.5
Updated Sep 28, 2026Editorial baselineHuman sign-off: TODO
Anthropic’s launch note says Sonnet 5.5 is faster than Sonnet 5 and cheaper for most work, beside Opus 5.5.
Anthropic’s page dated 28 Sep 2026 introduces Claude Sonnet 5.5 as a faster, lower-cost complement to Claude Opus 5.5, and says it is strongest on scoped everyday tasks, bug fixes, and polished documents.
The note says the model is on the Claude platform as claude-sonnet-5-5. This page does not turn that launch into a new writing score.
The weekly change list
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