Language

Nemotron 3 Ultra 550B-A55B (MoE)

NVIDIA Nemotron 3 Ultra — 550B total / 55B active hybrid Transformer-Mamba MoE with Latent MoE and a built-in Multi-Token-Prediction head; up to 1M context.

NVIDIA Open Model, Weights & DataSource verified

Specification

Model ID

nemotron-3-ultra-550b-a55b

Family

nemotron

Modality

Language

Parameters

550B (MoE, 55B active)

Context

1,048,576 tokens

Quantization

UD-Q4_K_XL

Weights

307.3 GB

Minimum RAM

360 GB

Source

Weights and provenance.

Repository

unsloth/NVIDIA-Nemotron-3-Ultra-550B-A55B-GGUF

Registry license

NVIDIA Open Model, Weights & Data

Access

Open — weights fetch without accepting additional terms.

The licence above is the registry's. The source repository either states nothing, states the catch-all “other”, or carries a licence link and base model that its own tag contradicts — a re-quantisation inherits the terms of the weights it derives from. The registry's licence is the one to rely on.

Serve it

# Pull the weights onto a node
tenzro model download nemotron-3-ultra-550b-a55b

# Serve it
tenzro model serve nemotron-3-ultra-550b-a55b

# Or query the registry entry over JSON-RPC
curl https://rpc.tenzro.xyz \
  -X POST -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,
       "method":"tenzro_getModel",
       "params":[{"model_id":"nemotron-3-ultra-550b-a55b"}]}'

Same family

Nemotron 3 Nano Omni 30B-A3B (MoE, multimodal)

30B (MoE, 3B active)

Nemotron 3 Nano 30B-A3B (MoE)

30B (MoE, 3B active)

Nemotron 3 Nano 4B

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