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

simonwillison.net · 2026-09-28 · Ranked: practitioner analysis · fresh 0.95 · score 2.19

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 →

simonwillison.net · 2026-09-28 · Ranked: agent match · practitioner analysis · fresh 0.93 · score 1.85

Quoting @joedaroo

To say that we were surprised at the jump and suddenness of the capabilities of our models when it came to “cyber” or “swarming” or “message boards” or anything else related to the incidents is an understatement. Secu... Context & related coverage →

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