Anthropic rolls out Sonnet 5 with near-Opus 4.8 performance at a lower price

Anthropic has released Claude Sonnet 5, a lower-cost Sonnet-class model that narrows the performance gap with the flagship Opus 4.8 by adding agentic features (planning, tool use, self-verification), improved coding and multi-step task performance, and competitive introductory API pricing; the article is a product-focused review and comparison rather than a security report.