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Anthropic launched Claude Sonnet 5.5, a mid-tier model priced at $2 per million input tokens and $10 per million output tokens — unchanged from Sonnet 5 and half the per-token price of Opus 5.5. Anthropic reports Sonnet 5.5 outperformed Opus 5.5 on Terminal-Bench 4.0, and an independent tester, Artificial Analysis, corroborated the lead while flagging that Sonnet 5.5 consumes more tokens per task than competing models.
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