Frontier reasoning at scale: NVIDIA Nemotron 3 Ultra for long-running agents on Lightning

Lightning AI has launched support for NVIDIA Nemotron 3 Ultra as a Day 0 partner, positioning the open-weight model as a reasoning and orchestration backbone for long-running, multi-agent systems. Nemotron 3 Ultra uses a 550-billion-parameter mixture-of-experts architecture with 55 billion active parameters and supports context windows of up to one million tokens, enabling planning, tool use, validation, and adaptation across complex workflows. The announcement argues that the model can reduce reliance on costly proprietary frontier models by offering lower agent-task costs, higher throughput than comparable open models, and control over model customization, data, and deployment. Through Lightning’s platform, developers can combine Ultra with specialized execution, speech, and safety models, optimize long-context inference, deploy across cloud, on-premises, or hybrid environments, and use enterprise governance and monitoring capabilities.

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