As of: 2026-11-13 13:49 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/m/gr00t-n1/

# Isaac GR00T N1 / N1.5 / N1.6

NVIDIA, Isaac GR00T family. Status: legacy. Type: robotics model. Released: 2025-03-18.

## How to call it

| Provider | Model id | Endpoint | Docs |
|---|---|---|---|
| Hugging Face | `nvidia/GR00T-N1-2B` |  | https://huggingface.co/nvidia/GR00T-N1-2B |
| Hugging Face | `nvidia/GR00T-N1.5-3B` |  | https://huggingface.co/nvidia/GR00T-N1.5-3B |
| Hugging Face | `nvidia/GR00T-N1.6-3B` |  | https://huggingface.co/nvidia/GR00T-N1.6-3B |
| GitHub (branches n1d5, n1d6) |  |  | https://github.com/NVIDIA/Isaac-GR00T |

## Pricing

- Price not published.
- Last checked: 2026-09-29

## Specs

- Input: text, image
- Output: action
- Context window: not published
- Max output: not published
- Open weights: yes
- Licence: NVIDIA license (see each Hugging Face model card; N1.6 card lists a non-commercial license)

## Where it stands

- Newer robotics models in the registry since its release: 27. The 5 newest:
  - Praxis-1 (2026-09-30) https://postcutoff.com/m/praxis-1/
  - Helix 2.5 (2026-09-17) https://postcutoff.com/m/figure-helix-2-5/
  - UnifoLM-WLA-1.0 (2026-09-10) https://postcutoff.com/m/unifolm-wla-1-0/
  - Skild S1 (Skild Brain) (2026-08-25) https://postcutoff.com/m/skild-s1/
  - Generalist GEN-1.5 (2026-08-19) https://postcutoff.com/m/generalist-gen-1-5/
- After it from NVIDIA: Isaac GR00T N2 (2026-03-16) https://postcutoff.com/m/gr00t-n2/
- Weights are public. Licence: NVIDIA license. See the licence for commercial terms.

## What stands out

- Open humanoid robot foundation model (first): Announced at GTC 2025 as 'the world's first open humanoid robot foundation model': a dual-system VLA (VLM 'System 2' + diffusion-transformer 'System 1') for cross-embodiment humanoid control, customizable with synthetic data. Source: https://nvidianews.nvidia.com/news/nvidia-isaac-gr00t-n1-open-humanoid-robot-foundation-model-simulation-frameworks

## Notes

N1 (2B) announced 2025-03-18; N1.5 (3B) mid-2025; N1.6 (3B) later in 2025 - exact N1.5/N1.6 dates not re-verified. Superseded by GR00T N1.7 (2026). 'first' is NVIDIA's claim (open weights for a humanoid-specific generalist model; earlier open VLAs such as OpenVLA/Octo targeted arms).

Sources: [NVIDIA newsroom (GR00T N1)](https://nvidianews.nvidia.com/news/nvidia-isaac-gr00t-n1-open-humanoid-robot-foundation-model-simulation-frameworks), [Isaac-GR00T GitHub](https://github.com/NVIDIA/Isaac-GR00T).

Model page: https://postcutoff.com/m/gr00t-n1/