Nvidia's Nemotron 3 Ultra tops every American open-weight AI system by a wide margin—but still trails the Chinese-led frontier.

Nvidia CEO Jensen Huang unveils Nemotron 3 Ultra at Computex 2026, a 500B-parameter open AI model targeting complex reasoning and agentic workflows.

According to benchmark platform Artificial Analysis, Nvidia's new Nemotron 3 Ultra is the most capable open AI model from the US to date.