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Nemotron 3 Ultra 550B-A55B
NVIDIA's largest open-weights Nemotron reasoning MoE (OpenMDW-1.1) with 550B total and 55B active parameters.
- NVIDIA
- Open weights
- Released 3 Jun 2026
Where it ranks
- AChat & assistantsModels · Local · 1,426 on LMArena Text Arena (overall, style control)
- CCodingModels · Local · 23 on Artificial Analysis Intelligence Index (secondary benchmark)
- CVector graphics & logosModels · Local · 1,069 on Design Arena SVG
Facts
- Vendor
- NVIDIA
- Family
- Nemotron Ultra
- Released
- 3 Jun 2026
- Weights
- Open: download and run it yourself
- License
- OpenMDW-1.1
- Parameters
- 560B (55B active)
- GPU memory to run locally
- ~321 GB (4-bit ≈ 560 B × 0.57 GB + 1.5 GB ≈ 321 GB, estimate.)
- API price
- $0.6 in / $2.4 out per 1M tokens (OpenRouter listed price)
- Access
- Free (open weights)
- Last verified
- 19 Oct 2026
Price from openrouter.ai, 19 Oct 2026.
Benchmark results
| Benchmark | Result | Entry on the leaderboard | As of | Source |
|---|---|---|---|---|
| Artificial Analysis Intelligence Index | 23 | Nemotron 3 Ultra 550B A55B (Reasoning)Raw value from the page's embedded model data; the site displays it rounded to an integer. | 19 Oct 2026 | artificialanalysis.ai |
| Design Arena SVG | 1,069 | Nemotron 3 UltraDesign Arena SVG, rank 99, 2142 battles; rows read from POST https://www.designarena.ai/api/leaderboard (arenaType 'models', category 'svg'); names from https://www.designarena.ai/api/registry | 19 Oct 2026 | designarena.ai |
| LMArena Text Arena (overall, style control) | 1,426 | nvidia-nemotron-3-ultra-550b-a55b-nvfp4From LMArena's official leaderboard-dataset (text_style_control, split latest, category overall, published 2026-10-15), which mirrors https://arena.ai/leaderboard/text. Rank 121; 11567 votes; 95% CI 1419.1-1432.9. | 15 Oct 2026 | huggingface.co |
Where you can use it
No tracked tool lists this model yet; as open weights it runs in local runtimes.