Nemotron 3 UltraOpen Source
Released
Nemotron 3 Ultra is an AI model released by NVIDIA on Thursday, Jun 4 2026, 85 days after Nemotron 3 Super. It is an open-source model — weights, and training code/data, released under an open license. It is a 550B parameter model. Benchmark results (shown below) cover SWE-Bench Verified, BrowseComp, Humanity's Last Exam, GPQA Diamond, and AA Intelligence Index.
Available from
| DeepInfra | $0.50 | $2.20 | 256K | fp4 |
|---|---|---|---|---|
| BaseTen | $0.60 | $2.40 | 200K | fp4 |
| Venice | $0.625 | $3.125 | 256K | fp8 |
Benchmarks
Coding
Agentic & tool use
Reasoning & science
Knowledge work
Source: BenchLM, retrieved 31 August 2026. Every other score here is the figure the lab published at launch.
About
Nemotron 3 Ultra, announced at Computex on June 1, 2026 and released with weights on June 4, was NVIDIA's largest published model: 550 billion total parameters with 55 billion active, in the same hybrid Mamba-Transformer mixture-of-experts architecture as its smaller siblings. It completed the Nano/Super/Ultra ladder the company had laid out when the generation opened the previous December.
At release it scored 48 on the Artificial Analysis Intelligence Index — the highest of any US-developed open-weight model at the time, well clear of the previous US leader Gemma 4 31B at 39, though still behind the strongest Chinese open flagships on the same index — alongside 86.7% on GPQA Diamond. NVIDIA leaned on the efficiency argument it had built the family around: over 300 tokens per second on its own hardware and markedly lower per-task cost than the open models above it on the leaderboard.
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Frequently asked questions
Nemotron 3 Ultra was released by NVIDIA on Thursday, Jun 4 2026.