Across 26 shared benchmarks, Claude Sonnet 4 scores higher on 7 and Nemotron 3 Ultra 550B A55B on 19. The widest gap is browsecomp, where Nemotron 3 Ultra 550B A55B scores 44.4 against 12.2. Nemotron 3 Ultra 550B A55B is the cheaper of the two on tracked API pricing ($0.68 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.