Top signals · Sep 28–29, 2026 · Updated Sep 29, 02:03 UTC

simonwillison.net · 2026-09-28 · Ranked: practitioner analysis · fresh 0.96 · score 2.21

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... Context & related coverage →

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