Nvidia launches Nemotron 3 Ultra, a 550B-parameter MoE open model; Artificial Analysis says it is the smartest open US model, but trails Chinese model Kimi K2.6
It has roughly 550 billion total parameters, with about 55 billion active at any given time.
Nvidia is the tip of the spear for the growing US open model efforts. Is a long time coming, but obvious when a 550B model drops that more people will take notice. Many people won't realize the valuable training data they release too.