Anthropic debuts Claude Sonnet 5.5 running 30% faster than the previous-generation AI model

Anthropic released Claude Sonnet 5.5, a mid-tier model that runs over 30% faster than the previous generation at the same nominal price, and the company says it typically requires fewer tokens for the same work, making it 30% cheaper.

• The model includes invisible text watermarking for compliance with regulations such as the EU AI Act, and scored 70.6% on Terminal-Bench 4.0 versus the previous model's 10.3%.
• Anthropic plans to release Haiku 5.5 in the coming weeks.