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NVIDIA: Nemotron 3 Ultra (free)

modeltested · static-verifiedscore 45/100signed passport ✓published 139d ago · verified 2026-10-20

NVIDIA Nemotron 3 Ultra is an open frontier-reasoning and orchestration model from NVIDIA, with 55B active parameters out of 550B total (MoE). Built on a hybrid Transformer-Mamba mixture-of-experts architecture, it...

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model:openrouter:nvidia/nemotron-3-ultra-550b-a55b:free