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claude2 min read

Claude Sonnet 5.5

Claude Sonnet 5.5 New Sonnet model from Anthropic today. They say it "runs 30%+ faster, and costs up to 30% less for most work" - it's priced the same as Sonnet 5 but appears to beat it on every benchmark, and should be cheaper to run as well. Here are some pelicans riding bicycles.

By Simon WillisonSimon Willison
Claude Sonnet 5.5

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Originally published by Simon Willison on Sep 28, 2026.

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