Anthropic launches Claude Sonnet 5.5: 30%+ faster, up to 30% cheaper than Sonnet 5

Claude Sonnet 5.5

Claude Sonnet 5.5 is the second model in the 5.5 family, aimed at everyday coding, bug fixes, and polished docs. It scores 70.6% on Terminal-Bench 4.0 vs. Sonnet 5's 10.3%. Pricing stays at $2/$10 per million input/output tokens, but it uses fewer tokens per task, cutting per-task cost by up to 30%. Speed is up 30%+. For the first time, a Sonnet model ships with cyber safeguards because its cybersecurity capabilities now match Opus 5. Haiku 5.5 is coming in a few weeks.

Why it matters: Anthropic officially released Claude Sonnet 5.5, the second model in the 5.5 family. Terminal-Bench jumped from 10.3% to 70.6%, 30% faster with 30% lower per-task cost at unchanged pricing. A same-day must-write model update. Not 95 because it's a complement to Opus 5.5, not a...