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Creating the NVIDIA Nemotron 3 Ultra NVFP4 Checkpoint with NVIDIA Model Optimizer

NVIDIA Developer Blog · published 26 June 2026

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Host
https://arxiv.org/abs/2606.15007
arxiv.org
https://research.nvidia.com/labs/nemotron/files/NVIDIA-Nemotron-3-Ultra-Technical-Report.pdf
research.nvidia.com
https://arxiv.org/abs/2210.17323
arxiv.org
https://arxiv.org/abs/2604.12374
arxiv.org
https://arxiv.org/pdf/2512.02010
arxiv.org
https://github.com/NVIDIA/Model-Optimizer/tree/main/tools/launcher/examples/nvidia/NVIDIA-Nemotron-3-Ultra-550B-A55B-BF16
github.com
https://github.com/NVIDIA/Megatron-LM/tree/main/examples/post_training/modelopt
github.com
http://quantize.sh/
quantize.sh
https://github.com/NVIDIA/Model-Optimizer/blob/db5497e2b1a5ab15a65aca9c2f157a56d5d6a276/modelopt_recipes/huggingface/models/nvidia/Nemotron-3-Ultra-550B-A55B/ptq/nvfp4-46-max.yaml
github.com
https://github.com/NVIDIA/Model-Optimizer/blob/main/modelopt_recipes/huggingface/models/nvidia/Nemotron-3-Ultra-550B-A55B/ptq/nvfp4-4o6.yaml
github.com
https://github.com/NVIDIA/Model-Optimizer/tree/main/tools/launcher
github.com
https://github.com/NVIDIA/Model-Optimizer/blob/main/tools/launcher/examples/nvidia/NVIDIA-Nemotron-3-Ultra-550B-A55B-BF16/megatron_lm_ptq.yaml
github.com
https://github.com/NVIDIA/Model-Optimizer
github.com
https://github.com/NVIDIA/Model-Optimizer/tree/47a33db9b639c5d25baaa3e49526f9703491eb08/examples/llm_ptq
github.com
https://build.nvidia.com/nvidia/nemotron-3-ultra-550b-a55b/modelcard
build.nvidia.com