Model · Language model
Nemotron 3 Ultra 550B A55B
An ungated 550B text reasoning model with an A55B mixture-of-experts architecture and up to 1M-token context, governed by the OpenMDW License Agreement 1.1.
- Developer
- NVIDIA
- Distribution
- Downloadable weights · Developer API
- Artifact licensing
- Open-licensed artifacts
- License scope
- Reviewed release artifacts and mandatory terms; not an assessment of training code or training data openness.
- Licenses
- OpenMDW License Agreement 1.1
- Boundary
- This record represents the nvidia/NVIDIA-Nemotron-3-Ultra-550B-A55B-BF16 v1.0 release dated June 4, 2026 at Hugging Face commit 77df655d5e9f8362164ed14dd8b48f8bce657498. The Super and Nano siblings, the NVFP4 checkpoint served by the trial endpoint, downstream quantizations, and NIM packaging are separate model or service boundaries.
Risk statements
Not yet examined.
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