Anthropic Ships Claude Sonnet 5.5, 30%+ Faster With 70.6% on Terminal-Bench 4.0

Anthropic released Claude Sonnet 5.5, priced identically to Sonnet 5 at $2/$10 per million input/output tokens but running 30%+ faster and up to 30% cheaper per task due to more efficient tool-call batching. Sonnet 5.5 scores 70.6% on Terminal-Bench 4.0 vs Sonnet 5's 10.3%, 80.1% on OSWorld 2.1, and hits 1,844 on GDPval-AA v2.1 — nearly matching Opus 5.5's 1,846. The model is available across AWS, Google Cloud and Azure under the identifier claude-sonnet-5-5, with Anthropic teasing a Haiku 5.5 to follow.