Anthropic Ships Sonnet 5, Claiming Opus-Class Performance at a Fraction of the Price

The new Sonnet posts substantial gains over 4.6 on reasoning, coding, and tool use — and Anthropic says it lands close to Opus 4.8 while costing less.

Anthropic released Claude Sonnet 5 on Tuesday, positioning it as the value tier that punches into premium territory. According to @claudeai, Sonnet 5 is "a substantial improvement over Sonnet 4.6 on reasoning, tool use, coding, and knowledge work," with performance "close to Opus 4.8, at lower prices." The post drew more than 4,000 likes, and the framing is deliberate: the story here is the price-performance ratio, not a raw capability crown.

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