Claude Sonnet 5.5 ships faster and cheaper, debuts #2 on Vals Index

A mid-tier model that runs over 30% faster and costs up to 30% less changes the cost and latency tradeoff for coding agents. Vals ranks it second overall, within 0.47 points of Opus 5.5.

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• postClaude Sonnet 5.5 ships: 30% faster, up to 30% cheaper per taskClaude
• articleSonnet 5.5D2OQZG8l5BI1S06
• postSonnet 5.5 nears Opus 5.5 on agentic evals but burns record output tokensArtificial Analysis

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