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/skild-s1/

# Skild S1 (Skild Brain)

Skild AI, Skild Brain family. Status: current. Type: robotics model. Released: 2026-08-25.

## How to call it

| Provider | Model id | Endpoint | Docs |
|---|---|---|---|
| Skild AI (commercial partners; early-access sign-up) |  |  | https://www.skild.ai/blogs/s1 |

## Pricing

- Price not published.
- Last checked: not recorded

## Specs

- Input: video, image, text
- Output: action
- Context window: not published
- Max output: not published
- Open weights: no
- Licence: proprietary

## Where it stands

- Newer robotics models in the registry since its release: 3:
  - 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/
- Closed weights.

## What stands out

- In-context learning from one video, long-horizon (first): Learns tasks never seen in pretraining (potting a plant, cooking pancakes, pour-over coffee, kit assembly) from a single video prompt with no fine-tuning, for tasks up to ~10 minutes long; Skild calls this the first robotics foundation model to show in-context learning on such long unseen tasks. Source: https://www.skild.ai/blogs/s1
- Video prompting beats language prompting: 66% success on unseen tasks vs 9% for an equivalently trained language-prompted policy (~7x); 96% on seen tasks; one demo video worth ~380 post-training episodes; 11 minutes from demonstration to autonomous execution in the plant-potting example. Source: https://www.skild.ai/blogs/s1
- Omni-bodied brain: Skild Brain is pitched as one model controlling quadrupeds, humanoids, arms and mobile manipulators without prior knowledge of the body; S1 trains on teleop, human video, simulation and data-capture gloves. Source: https://www.therobotreport.com/skild-ai-unveils-s1-flagship-robot-foundation-model/

## Notes

Announced on X 2026-08-25 (https://x.com/SkildAI/status/2092300842900865389); press 2026-08-31; NVIDIA blog 2026-09-10 (https://blogs.nvidia.com/blog/skild-ai-s1-physical-ai/) cites a $100M revenue run rate 10 months after first commercial deployment, 60+ deployment partnerships and Blackwell assembly work with Foxconn. Skild raised a $1.4B Series C at >$14B (2026-01-14, led by SoftBank). No public API, pricing or weights; company says S1 is "already at work with our commercial partners" and plans wider real-world rollout by 2027. Results are company-reported.


Model page: https://postcutoff.com/m/skild-s1/