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Anthropic launched Claude Sonnet 5 on June 30, 2026, calling it its most agentic Sonnet yet -- it plans, drives browsers and terminals, and runs autonomously. It is the default for Free and Pro, available across all plans, in Claude Code, and on the API as claude-sonnet-5. Anthropic later made its $2 per million input and $10 per million output token pricing permanent.
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