Nemotron 3 Ultra 550B A55B (NVFP4)
NVIDIA · 2026-06-04 · 560.5B parameters
Nemotron 3 Ultra 550B A55B (NVFP4) is the NVFP4 checkpoint named by the Judgemark source. It is the 550B-class NVIDIA Nemotron 3 Ultra A55B model with a hybrid LatentMoE/Mamba-2/attention architecture and a documented 1,048,576-token context; this row preserves the source's exact quantized artifact identity rather than conflating it with the separately named BF16 checkpoint.