NVIDIA Nemotron 3 Ultra
NVIDIA Nemotron 3 Ultra publishes its weights, but at 550B parameters (55B active per token) no consumer machine holds the checkpoint. This page covers the access paths that work and the open models that actually run locally.
Why you can't run NVIDIA Nemotron 3 Ultra locally
At 550B parameters (55B active per token), a Q4-class build of NVIDIA Nemotron 3 Ultra would need roughly 330 GB — only a maxed-out 512GB Mac Studio could even hold the weights, with no real headroom. That figure is arithmetic, not opinion: 0.6 GB per billion parameters is the standard Q4 rule we apply across the whole catalog. The weights themselves are public (official source linked below); capacity, not licensing, is the wall.
What works instead: the hosted API. For most workloads, the open models below deliver the same job on hardware that fits under a desk.
Jun 4, 2026 NVIDIA release. 550B total / 55B active hybrid Mamba-2 + MoE, up to 1M context. SWE-Bench Verified 70.7. Weights are open (OpenMDW-1.1, nvidia/NVIDIA-Nemotron-3-Ultra-550B-A55B-BF16 on HF; community GGUF is ~188GB even at 2-bit), so self-hosting needs a ~256GB-class multi-node rig. No consumer tier fits it and Ollama's tag is cloud-only, hence listed as cloud.
What to run locally instead of NVIDIA Nemotron 3 Ultra
More Nemotron models
Frequently asked questions
Can I run NVIDIA Nemotron 3 Ultra locally?
Not on hardware you can buy. The weights are public, but NVIDIA Nemotron 3 Ultra is a 550B-parameter model (55B active), and a Q4-class build would need roughly 330 GB — only a maxed-out 512GB Mac Studio could even hold the weights, with no real headroom. Until the ecosystem ships a smaller official build, the API or a smaller open model is the practical path.
How do I access NVIDIA Nemotron 3 Ultra?
Through the vendor's hosted API. The official source is linked on this page.
What is the best local alternative to NVIDIA Nemotron 3 Ultra?
Qwen3 235B A22B is the strongest local model we track (235B, from 192 GB machines), with Qwen3.5 122B-A10B Instruct close behind. Both run on a single high-memory Mac or GPU — see their pages for exact hardware.
Cite this page
ModelFit: NVIDIA Nemotron 3 Ultra — specs, memory math and hardware verdicts. https://modelfit.io/models/nemotron-3-ultra/ (dataset updated 2026-09-03, CC BY 4.0).