Across 63 shared benchmarks, Claude Sonnet 4.5 scores higher on 62 and Kimi K2 Instruct on 1. The widest gap is FinSearchComp-T3, where Claude Sonnet 4.5 scores 44 against 10.4. Kimi K2 Instruct is the cheaper of the two on tracked API pricing ($0.60 against $3.00 per million input tokens).
Best tracked score per model per benchmark (default configuration; source-attributed). ↓ marks lower-is-better metrics. Open either model for its full surface, provenance and pricing. Quoted rates are the price-setter row we currently track for each model — its direct or vendor-official listing where one exists (anthropic-official, direct), otherwise the lowest tracked offer.