Anthropic released Claude Sonnet 5 on Tuesday, confirming months of speculation about an upgrade to its mid-tier AI model. According to the company's official announcement, the new model is designed to be its "most agentic Sonnet model yet." Meaning it is capable of planning, using tools like browsers and terminals, and operating autonomously — all at a level previously reserved for larger, pricier systems.
Anthropic says Sonnet 5 is a substantial improvement on its predecessor, Sonnet 4.6, across reasoning, coding, and knowledge-work benchmarks, and performs close to the company's flagship Opus 4.8 model while costing significantly less to run.
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And in an industry increasingly plagued by sticker shock over the price tokens, Sonnet offers a brief respite. The model launches with introductory pricing of $2 per million input tokens and $10 per million output tokens through August 31, after which the standard pricing of $3 per million input tokens and $15 per million output tokens takes effect.
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