Model dossier

NVIDIA: Nemotron 3 Ultra

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...

ProviderNVIDIA Start comparison

Context512,288

Max outputn/a

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Identity

NVIDIA: Nemotron 3 Ultra

Model ID: nvidia/nemotron-3-ultra-550b-a55b
Canonical slug: nvidia/nemotron-3-ultra-550b-a55b-20260604
Knowledge cutoff: n/a
Created: 6/4/2026

Capabilities

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Modalities

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Capacity

Context512,288

Max outputn/a

TokenizerOther