model releaseNVIDIA
Nvidia Releases Nemotron 3 Ultra: 550B Parameter MoE Model with 1M Token Context Window
Nvidia has released Nemotron 3 Ultra, a 550B parameter mixture-of-experts model with 55B active parameters and a 1M token context window. The model uses a hybrid Transformer-Mamba architecture and is available for free through OpenRouter, targeting agentic workflows and multi-step reasoning tasks.
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