NVIDIA Nemotron 3 Ultra
The first open frontier model built for agents
NVIDIA Nemotron 3 Ultra launched on June 5, 2026 with 5 votes, #2,466 of 22,647 launches that month and more than 75% of that year's launches.
What it does
NVIDIA's 550B Mixture-of-Experts model with hybrid Mamba-Attention architecture, delivering 300+ tokens/sec with a 1M-token context window. Top-ranked US open-weights model on the Artificial Analysis Intelligence Index. Built specifically for multi-step agent loops where frontier reasoning at open-source economics actually matters. Available now on Hugging Face, OpenRouter, ModelScope, and build.nvidia.com as a NIM microservice.
Open, efficient hybrid Mamba-Transformer MoE with 1M context, excelling in agentic reasoning, coding, planning, tool calling, and more
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Nemotron 3 Ultra by NVIDIAJun 2026 · developer.nvidia.com · ▲179Powers faster, efficient reasoning for long-running agents
Nemotron 3 SuperMar 2026 · developer.nvidia.com · ▲8Open hybrid Mamba-Transformer MoE for agentic reasoning
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