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Anthropic Releases Claude Sonnet 5.5, Nearly Matching Opus 5.5 at Lower Cost

Anthropic has launched Claude Sonnet 5.5, the second model in its Claude 5.5 family, delivering more than 30 percent faster output and up to 30 percent lower cost per task while nearly matching the performance of Opus 5.5 on knowledge-work benchmarks. A dramatic jump on the Terminal-Bench coding test signals a major capability upgrade.

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Anthropic has launched Claude Sonnet 5.5, the second model in its Claude 5.5 family, delivering more than 30 percent faster output and up to 30 percent lower cost per task while nearly matching the performance of Opus 5.5 on knowledge-work benchmarks. A dramatic jump on the Term…