Introducing Claude Sonnet 5

Claude Sonnet 5 is the most agentic Sonnet yet and it makes plans, uses tools like browsers and terminals, and runs autonomously at a level that just a few months ago required larger and more expensive models.

Sonnet 5 is a substantial improvement over Sonnet 4.6 on reasoning, tool use, coding, and knowledge work. Its performance is close to Opus 4.8.

Sonnet 5 finishes complex tasks where previous Sonnets stopped short, checks its own output without being asked, and does all its agentic work while being cheaper. It is now default on Free and Pro platforms.

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