Anthropic launches Claude Sonnet 5 with stronger agent skills and lower price

Anthropic has released Claude Sonnet 5, calling it the most capable agent model in its Sonnet lineup. It can plan tasks, use browsers and terminal tools, and run on its own.

Developers can access it via Claude Code and Platform. During a promotional period ending August 31, 2026, input costs $2 per million tokens and output $10. After that, prices rise to $3 and $15.

In benchmarks for agent search and computer use, Sonnet 5 shows big improvements over Sonnet 4.6, even matching Opus 4.8 in some areas. Anthropic also reports lower rates of bad behavior and better resistance to prompt injection.