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simon_willison ยท Sep 28, 2026 ยท news

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Claude Sonnet 5.5

simonwillison.netSep 28, 2026
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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...

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