The closest alternative to Nemotron 3 Ultra is GPT-5.1 — comparable intelligence (47.7 vs 47.7); for a cheaper option, MiniMax M3 runs $0.300/M vs $0.500/M; for more speed, MiniMax M2.7 hits 273 t/s; and the best open-weight substitute is MiniMax M3.
GPT-5.1 is the closest alternative to Nemotron 3 Ultra, with an Intelligence Index of 47.7 (Nemotron 3 Ultra scores 47.7) at $1.25 per million input tokens.
Yes — MiniMax M3 costs $0.300 per million input tokens versus $0.500 for Nemotron 3 Ultra, while staying within ~8 points of its Intelligence Index.
MiniMax M3 is the strongest open-weight alternative to Nemotron 3 Ultra — downloadable from Hugging Face and self-hostable, scoring 54.7 on intelligence.