Anthropic ships Claude Sonnet 5 with near Opus-level reasoning at lower cost
Anthropic released Claude Sonnet 5, a mid-tier model designed for autonomous agent tasks. It performs close to Claude Opus 4.8 at a lower cost, showing significant improvements in reasoning, tool use, coding, and multi-step task completion. It is available at temporary introductory rates of $2/M input and $10/M output tokens through August 31, 2026.