According to benchmark platform Artificial Analysis, Nvidia’s new Nemotron 3 Ultra is the most capable open AI model from the US to date. It has roughly 550 billion total parameters, with about 55 billion active at any given time. On the Artificial Analysis intelligence ranking, Nemotron 3 Ultra scores 48 points, well ahead of other open US models like Gemma 4 31B (39), Nemotron 3 Super (36), and gpt-oss-120b (33). It doesn’t reach the top open models from China, though. Kimi K2.6 scores 54 points there. The current strongest closed model, Opus 4.8, hits 61 points.

Full report : Nvidia launches Nemotron 3 Ultra, a 550 billion-parameter MoE open model; Artificial Analysis says it is the smartest open US model, but trails Chinese model Kimi K2.6.