nemotron-3-ultra-550b-a55b-free · Nvidia
NVIDIA Nemotron 3 Ultra is an open frontier-reasoning and orchestration model featuring an extensive 1,000,000-token context length. Built on a hybrid Transformer-Mamba mixture-of-experts (MoE) architecture, it operates with 55B active parameters out of a total of 550B parameters. This advanced structure is designed to support sophisticated reasoning and complex task orchestration.
NVIDIA Nemotron 3 Ultra is an open frontier-reasoning and orchestration model featuring an extensive 1,000,000-token context length. Built on a hybrid Transformer-Mamba mixture-of-experts (MoE) architecture, it operates with 55B active parameters out of a total of 550B parameters. This advanced structure is designed to support sophisticated reasoning and complex task orchestration.
Nemotron 3 Ultra 550B A55B (free) has a 1,048,576 token context window.
Nemotron 3 Ultra 550B A55B (free) accepts text input.
Nemotron 3 Ultra 550B A55B (free) supports reasoning, tool calling and long context. Per-protocol parameter support is listed in the capability table on this page.
Nemotron 3 Ultra 550B A55B (free) is available through the AIHubMix unified API. The API is OpenAI-compatible: point your OpenAI SDK at https://aihubmix.com/v1, use your AIHubMix API key, and set the model name to nemotron-3-ultra-550b-a55b-free — no other code changes needed.
Nemotron 3 Ultra 550B A55B (free) is developed by Nvidia. AIHubMix aggregates it alongside models from other providers behind one API and one bill.
Nemotron 3 Ultra 550B A55B (free) was released on June 4, 2026 by Nvidia.
NVIDIA Nemotron 3.5 Super VL is an open, multimodal mixture-of-experts model developed by…
NVIDIA Nemotron 3.5 Lightning is an open mixture-of-experts model from NVIDIA, featuring…
Developed by Nvidia, NVIDIA Nemotron™ 3 Nano Omni is a 30B-A3B open multimodal model…
Developed by NVIDIA, Nemotron 3.5 Content Safety is a compact 4B-parameter multimodal…
An open-source, efficient hybrid Mamba-Transformer MoE model that supports a context…
Use Nemotron 3 Ultra 550B A55B (free) via the AIHubMix unified API — one interface for every major LLM.