Claude Sonnet 5

Anthropic's new Sonnet model, now the default for Free and Pro users, with performance close to Opus 4.8 at a lower price.

Plans and runs multi-step tasks on its own, using tools like browsers and terminals, at a level that recently needed larger and pricier models
Improves on Sonnet 4.6 in reasoning, coding, tool use, and knowledge work, with fewer unwanted behaviors
Now the default model on the Free and Pro plans, and available to Max, Team, and Enterprise users plus Claude Code and the Claude API
API name is claude-sonnet-5; introductory pricing is $2 per million input tokens and $10 per million output tokens through August 31, 2026, then $3 and $15