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Nemotron Labs TwoTower

NVIDIAOpen WeightsPending Human Review

Nemotron Labs TwoTower is an open research language model that separates autoregressive context processing from block-wise diffusion generation. A frozen Nemotron 3 Nano context tower encodes preceding clean tokens, while a trainable denoiser tower refines blocks through cross-attention. The released system contains both sparse towers. It investigates parallel token generation and the quality-throughput tradeoff rather than a new chat product. Reported speedups depend on block size, confidence thresholds, hardware, and the autoregressive baseline used in the paper.

2026-06-25
~60B total; ~3B active per tower
Two-tower block diffusion over hybrid Mamba-2/Transformer MoE
NVIDIA Nemotron Open Model License

Specifications

Parameters
~60B total; ~3B active per tower
Architecture
Two-tower block diffusion over hybrid Mamba-2/Transformer MoE
License
NVIDIA Nemotron Open Model License
Type
text
Modalities
text

Benchmark Scores

Advanced Specifications

Model Family
Nemotron Labs
API Access
Not Available
Chat Interface
Not Available

Capabilities & Limitations

Capabilities
block diffusion text generationparallel decoding
Known Limitations
Research checkpointTwo towers add memory costThroughput depends on operating point
Notable Use Cases
efficient language-model researchdiffusion decoding experiments

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