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Opening
Claude Sonnet 5 is built to be the most agentic Sonnet model yet. It can make plans, use tools like browsers and terminals, and run autonomously at a level that, just a few months ago, required larger and more expensive
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- 2026-09-26
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Working with Claude Sonnet 5
The charts below compare the performance of Sonnet 5 with Sonnet 4.6 and Opus 4.8 at different effort levels on the agentic search evaluation BrowseComp and the computer use evaluation OSWorld-Verified. Sonnet 5 (orange
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Safety evaluations
Our pre-deployment safety evaluations found that Sonnet 5 was overall an improvement on Sonnet 4.6. On agentic safety, the model is better at refusing malicious requests and resisting hijack attempts in prompt injection
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Availability and pricing
Claude Sonnet 5 is available everywhere today at $2 per million input tokens and $10 per million output tokens2. We’ve increased rate limits across Chat, Cowork, Claude Code, and the Claude Platform3 to accommodate the h
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Related content
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