Nemotron 3 Ultra

Nemotron 3 Ultra is NVIDIA's open-weights model, released 2026-06-04, and its listing name shows 550 billion total parameters with 55 billion active. OpenRouter lists $0.6 per million input tokens and $2.4 output, with a 262,144-token context and text-only input and output. Its licence in our data is open-weights, so check NVIDIA's terms before using it commercially. We would suggest it for teams that want a very large open model from a hardware vendor and have the capacity to host it, or want to use it through a gateway. The limit is size: a 550B model needs serious GPU memory to self-host, so most readers will use a hosted route, and the context is shorter than that of Nemotron 3 Super. We have not tested it ourselves. Prices and specifications come from the OpenRouter listing we checked on 31 October 2026, and we have not tested the model ourselves.