NVIDIA · Open weights

NVIDIA-Nemotron-3-Ultra-550B-A55B-BF16

Name: NVIDIA-Nemotron-3-Ultra-550B-A55B-BF16
Author: NVIDIA

Weights are free to download and run locally or on your own servers – no per-call fees; licence terms apply.

Open weights Available 🛠 Tool calling 256K 🕒 Verified on 2026-10-10

Note: Licence is tagged “other” (NVIDIA open model licence) on Hugging Face – read the model card.

Free conditions

Free conditions: Weights are free to download and run locally or on your own servers – no per-call fees; licence terms apply.
Free until: —
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Sign-up / login: Not required
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Data use: When self-hosted, your data stays on your machine.

ⓘ Free to download; running it needs your own hardware or a paid host.

Specs

Provider: NVIDIA
Platform: Hugging Face
Type: Open weights
Modalities: Text
Parameters: ≈561B (from weight files)
Context length: 256K (262,144 tokens)
License: other
Tool calling: Yes
Released: 2026-06-03

How to access

Hugging Face: https://huggingface.co/nvidia/NVIDIA-Nemotron-3-Ultra-550B-A55B-BF16

Official sources

Hugging Face – nvidia/NVIDIA-Nemotron-3-Ultra-550B-A55B-BF16 https://huggingface.co/nvidia/NVIDIA-Nemotron-3-Ultra-550B-A55B-BF16
OpenRouter models API（工具调用字段 / tool-calling field） https://openrouter.ai/api/v1/models

🕒 Verified on 2026-10-10 · Free terms change often. Always confirm limits, data-use policy and regional availability on the official page before relying on a free tier.

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Free conditions

Specs

How to access

Official sources

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