NVIDIA releases Nemotron 3 Ultra, a 550B parameter open-weights model

NVIDIA has released Nemotron 3 Ultra, a 550-billion-parameter open-weights model that sets a new benchmark for US-based releases. This hybrid Mamba-Transformer mixture-of-experts model features a 1M-token context window and is optimized for agent harnesses. While it achieves a high score on the Artificial Analysis Intelligence Index, it trails behind some Chinese and closed-source models in raw capability but excels in speed, processing over 300 tokens per second. AI

IMPACT Sets a new high-water mark for US open-weights models, particularly in speed, potentially influencing agent development.

RANK_REASON Frontier-lab model release with system card. [lever_c_demoted from frontier_release: ic=1 ai=1.0]

Read on dev.to — LLM tag →

• Anthropic
• Artificial Analysis Intelligence Index
• DeepSeek
• Hermes Agent
• Kimi K2.6
• LangChain Deep Agents
• Moonshot
• Nemotron 3 Ultra
• NVIDIA
• OpenCode
• OpenHands
• Opus 4.8

• model release
• infra

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