SITUATION EXPLAINED: Sonnet 5.5 costs the same as Sonnet 5 and beats GPT-6 Sol on knowledge work. • It also needs far fewer tokens to do the same work • On GDPval it gained roughly 400 Elo over Sonnet 5, and nearly 10 percentage points on Humanity's Last Exam • It beats Opus 5.5 on Terminal-Bench 4.0, 70.6% to 66.4% • Against Sonnet 5, 3 months ago, Terminal-Bench 4.0 went from 10.3% to 70.6%, and GDPval from 1449 to 1844 • First Sonnet with cyber safeguards and fallbacks matching Anthropic's…

Claude@claudeai4h ago

Introducing Claude Sonnet 5.5, the second model in the Claude 5.5 family. It’s a clear upgrade over Sonnet 5, runs more than 30% faster, and costs up to 30% less for most work.