Anthropic ships Claude Sonnet 5.5: 30%+ faster, strong agentic coding
Anthropic released Claude Sonnet 5.5 on Sept 28: same $2/$10 per MTok as Sonnet 5 but typically up to 30% cheaper per task, 30%+ faster output, and 70.6% on Terminal-Bench 4.0 (vs Sonnet 5’s 10.3%). It’s the everyday coding and docs workhorse next to Opus 5.5, and the first Sonnet with Opus-class cyber safeguards; API id is claude-sonnet-5-5.
