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Anthropic's Claude Sonnet 5 brings near-flagship power to the default tier
- Anthropic released Claude Sonnet 5 on 30 June and made it the default for Free and Pro users: a mid-size model with performance close to the larger Opus 4.8 at a fraction of the cost.
- It is built to run agentically, planning and using tools like browsers and terminals autonomously at a level that recently needed bigger, pricier models, with introductory pricing of $2/$10 per million input/output tokens until 31 August.
- For adopters it pushes capable, cheaper AI into the default tier, and Anthropic says it is also more resistant to prompt-injection and misuse than its predecessor, which matters if you are deploying agents on real workflows.