Nvidia Nemotron 3 Ultra (opens in new tab)

We are releasing NVIDIA Nemotron 3 Ultra - our largest and most capable model yet. Nemotron 3 Ultra is a 55B active 550B total parameter Mixture-of-Experts hybrid Mamba-Transformer model that leverages Latent MoE, includes MTP Layers, and was pre-trained in NVFP4.