Across 47 shared benchmarks, Claude Opus 4 scores higher on 27 and Kimi K2 Instruct on 18, with 2 level. The widest gap is HMMT 2025, where Kimi K2 Instruct scores 38.8 against 15.9. Kimi K2 Instruct is the cheaper of the two on tracked API pricing ($0.60 against $15.00 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.