On June 1, 2026, at the Computex conference in Taipei, NVIDIA CEO Jen-Hsun Huang releasedNemotron 3 Ultra——A 550 billion parameter (550B) open weight mixed expert (MoE) model, positioned as "born for long-running AI agents."The most powerful open source AI model in the United States.
core competencies
Nemotron 3 Ultra adopts a 90% sparse MoE architecture, which only activates about 55B parameters out of 550B for each inference, significantly reducing computing costs while ensuring inference quality.Agent workflow——Including planning, reasoning, tool invocation, code writing and debugging, research assistance, and long-term tasks across steps.
- total parameters: 550B, each inference activation is about 55B
- Architecture: Mixed Expert Model (MoE), 64 experts, 8 per activation
- context window:Support long sequence reasoning
- License Agreement：Linux Foundation OpenMDW open source protocol, weights, data, and training recipes are all open
- Deployment method:Supports cloud, local and edge deployment
User experience/limitations
The advantages of Nemotron 3 Ultra are obvious: completely open, optimized for agents, and highly efficient in reasoning.Claude There is still a clear gap between closed source flagships such as Opus 4.8 (60+ points) and GPT-5.5.
Overall Score
| 维度 | Score | evaluate |
|---|---|---|
| functional completeness | 7.5 / 10 | The agent workflow has comprehensive coverage, but lacks multi-modal capabilities and consumer-level scene optimization |
| 易用性 | 6.0 / 10 | The deployment threshold is extremely high (multi-card cluster required), and ordinary users cannot use it directly. |
| Cost-effectiveness | 8.0 / 10 | Completely open source and free, MoE architecture inference cost is low, commercial license is friendly |
| 中文支持 | 5.0 / 10 | There is currently no Chinese benchmark test data. The training data is mainly in English, and the Chinese ability is questionable. |
| 输出质量 | 7.5 / 10 | The AI² index is 48 points. The United States has the strongest open source, but there is still a gap between it and the closed source flagship. |
Overall rating: 6.8/10
NVIDIA Nemotron 3 Ultra is an important milestone for the open source AI community - it proves that American laboratories can also produce competitive open weight models.
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