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Anthropic released Claude Sonnet 5 on June 30, 2026, making it the default model for Free and Pro plans while also offering it to Max, Team, and Enterprise users. The model delivers agentic capabilities, including autonomous browser use, terminal access, and multi-step task execution, previously associated only with larger Opus-class models. Anthropic's safety assessments found lower rates of undesirable behaviors than its predecessor Sonnet 4.6, though the model's significantly expanded autonomous capabilities introduce new governance obligations for enterprise deployers.
