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Claude Sonnet 5.5 brings faster, lower-cost coding and agent work

Anthropic launched Sonnet 5.5 as a faster complement to Opus 5.5. It reports 30%+ faster output than Sonnet 5 and up to 30% lower cost per task through fewer tokens at the same $2/$10 per-million-token API rates. Anthropic's benchmark comparisons are vendor-reported, not independently reproduced.

Published (date only)Updated 5 sources

Primary source

Anthropic · September 28, 2026

Read the original: Introducing Claude Sonnet 5.5

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