Anthropic Releases Claude Sonnet 5.5 as Faster, Lower-Cost Coding Model

Anthropic released Claude Sonnet 5.5 on September 28, 2026, positioning the mid-tier Claude model as a faster, lower-cost workhorse for coding, agents and professional work. The company says the model runs 30%+ faster than Claude Sonnet 5 and can cost up to 30% less per task while keeping the same $2 input and $10 output price per million tokens.