Across 38 shared benchmarks, GPT-5.6 Sol scores higher on 34 and Nemotron 3 Ultra 550B A55B on 4. The widest gap is OmniScience Non-Hallucination, where Nemotron 3 Ultra 550B A55B scores 70.3 against 10.6. Nemotron 3 Ultra 550B A55B is the cheaper of the two on tracked API pricing ($0.68 against $4.00 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 (direct, direct), otherwise the lowest tracked offer.