# Nemotron 3 Ultra 550B A55B BF16

Nemotron 3 Ultra 550B A55B BF16 is a model from NVIDIA with open weights, first recorded on 7 Oct 2026; its release date is not established. The context window is 262,144 tokens.

- Developer: NVIDIA
- Id: nvidia/NVIDIA-Nemotron-3-Ultra-550B-A55B-BF16
- Sighting: 2026-10-07T19:40:57.518Z
  - [evidence link](https://huggingface.co/nvidia/NVIDIA-Nemotron-3-Ultra-550B-A55B-BF16)
- Status: Released
- Weights version: 2026-06-03
  - [evidence link](https://huggingface.co/api/models/nvidia/NVIDIA-Nemotron-3-Ultra-550B-A55B-BF16/paths-info/77df655d5e9f8362164ed14dd8b48f8bce657498)
- Canonical: https://alexgetman.com/models/nvidia/nvidia-nemotron-3-ultra-550b-a55b-bf16/

## Questions

### What is the context window of Nemotron 3 Ultra 550B A55B BF16?

The context window is 262,144 tokens.

### Are the weights of Nemotron 3 Ultra 550B A55B BF16 publicly available?

Yes. NVIDIA publishes the weights.

### When was Nemotron 3 Ultra 550B A55B BF16 released?

Its release date is not established. Signal Forge first recorded it on 7 Oct 2026.

## Evidence links

- [hf-author-artifacts:nvidia](https://huggingface.co/api/models/nvidia/NVIDIA-Nemotron-3-Ultra-550B-A55B-BF16/paths-info/77df655d5e9f8362164ed14dd8b48f8bce657498)
- [huggingface-router](https://huggingface.co/nvidia/NVIDIA-Nemotron-3-Ultra-550B-A55B-BF16)

## Signals