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14 Nov 2026 · Reel notes

Praxis-1: Runway's robot brain is open

Runway just put the weights of its robot-control model out in the open.

Praxis-1 is a world action model: it predicts the next video frame and the robot’s next moves together.

  • 27B-parameter mixture-of-experts diffusion transformer
  • #1 world action model on NVIDIA’s RoboLab-120 (46.2% success over 1,200 episodes)
  • Open weights under Apache 2.0, commercial use allowed
  • Weights on Hugging Face, code on GitHub, LoRA fine-tuning for your own robot

I’m planning to play with this myself. What would you put it on first?

Sources: Runway, “Praxis-1 is now available” (runway.com/news/company-news/praxis-1-is-now-available). Images: Runway.

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