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Sonnet 5.5 matches Opus performance at lower cost and speed
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Sonnet 5.5 is out. It gets remarkably close to Opus 5.5 on most coding and agentic work, at a fraction of the cost and noticeably faster. Opus is still the go-to for the gnarliest, long-horizon problems. For everything else, Sonnet 5.5 is going to be hard to beat.
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