Anthropic Launches Cheaper Claude Sonnet 5.5

Anthropic released Claude Sonnet 5.5 on Monday, a mid-tier model running over 30% faster and 30% cheaper than Sonnet 5 at $2 per million input tokens and $10 per million output tokens. It outperforms Opus 5.5 on agentic coding benchmarks and adds invisible text watermarking for EU AI Act compliance. A Haiku model follows in coming weeks.