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Nemotron 3 Ultra

NVIDIAOpen WeightsPending Human Review

Nemotron 3 Ultra is an open-weight NVIDIA language-model release. The largest released Nemotron 3 tier targets difficult reasoning, software engineering, and long-running tool workflows. Latent mixture-of-experts routing and multi-token prediction support efficient frontier-scale training and serving. Downloadable base and post-trained weights are available in several precisions. The license permits commercial and non-commercial use subject to its published terms.

2026-06-04
550B total, 55B active
Hybrid Mamba-2 / Transformer mixture-of-experts with latent experts and multi-token prediction
OpenMDW-1.1

Specifications

Parameters
550B total, 55B active
Architecture
Hybrid Mamba-2 / Transformer mixture-of-experts with latent experts and multi-token prediction
License
OpenMDW-1.1
Context Window
1,048,576 tokens
Type
text
Modalities
text

Benchmark Scores

Advanced Specifications

Model Family
Nemotron
API Access
Available
Chat Interface
Not Available

Capabilities & Limitations

Capabilities
reasoningcoding
Known Limitations
Requires large multi-GPU deployment; reported results can depend on tools and inference budgetOutputs may be incorrect despite reasoning traces
Notable Use Cases
model researchself-hosted reasoningspecialist data generation

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