NVIDIA's open-weight ~550B mixture-of-experts LLM with a hybrid Mamba-transformer design, aimed at agentic workloads.
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Nemotron 3 Ultra is the largest model in NVIDIA's Nemotron 3 family of open models. According to creator coverage, it is a mixture-of-experts model with roughly 550B total parameters and 55B active per token, built on a hybrid Mamba-transformer architecture with NVFP4 low-precision support and multi-token prediction. It supports a context window of about 1M tokens, and the weights are reported to be around 350 GB.\n\nNVIDIA positions it for agentic use cases and cost-efficient inference. Creators report claims of about 5x faster inference and roughly 30% lower cost than other open models; these figures are vendor claims relayed by third parties and were not verified against official pages here.\n\nThe model is distributed as open weights, so it can be self-hosted or run on cloud infrastructure, and it is aimed at enterprises and developers building agents. NVIDIA's site also promotes Nemotron for European sovereign AI and local-language post-training, for example French. The official license, exact release date and download links were not present in the provided material.
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Open 550B mixture-of-experts model with 55B active, hybrid Mamba-transformer, NVFP4 and multi-token prediction, 1M context. Claimed 5x faster inference and about 30% lower cost than other open models; weights are 350GB.
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