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Runway Praxis-1: open-weight robotics model under Apache 2.0

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Runway released its Praxis-1 world action model with open weights under Apache 2.0. The 27-billion-parameter MoE diffusion model leads NVIDIA's RoboLab-120 leaderboard at 46.2% success and can be adapted to your own robot with LoRA.

· 2 min read

A Runway Praxis-1 bejelentő képe: két robotkar egy asztal fölött, középen a Praxis-1 is Now Available felirat
Image: Runway · Press kit · Source

What Runway released

Praxis-1 was introduced in September as Runway's first world action model. Now anyone can download the weights plus the inference and fine-tuning code under Apache 2.0, including for commercial use (Runway).

  • A 27B-parameter mixture-of-experts diffusion transformer that predicts video and actions together.
  • Built on the same large-scale video pretraining as Runway's general world models.
  • Available on GitHub, on Hugging Face with native LeRobot support, in vLLM-Omni, and with hosted inference on Reactor.
  • Runs on H100 and B200, RTX 5090 and RTX PRO 6000, and on Jetson Thor on the robot itself.

The numbers

On NVIDIA's RoboLab-120 leaderboard it reaches 46.2% success across 1,200 episodes, ahead of FLUX 3 Action (42.9%), Cosmos3 Nano (36.8%) and π0.5 (28.0%). Runway says it outperforms every open-weight VLA.

Fine-tuned on Google's RT-1 robot, which never appeared in its training data, Praxis-1 reaches 80.0% on SimplerEnv, against 52.4% for the original RT-1 policy.

Adapting it to your hardware

Launch partners Noble Machines, Standard Bots and Ultra ran it on a legged humanoid, a six-axis industrial arm and a dual-arm warehouse robot. Both full fine-tuning and LoRA are supported, and LoRA lets you adapt it to your embodiment, cameras and tasks without retraining the full model. NeMo Automodel tutorials cover post-training.

Why it matters

A commercially usable open-weight robotics model at this level is rare. Runway is a founding member of the Cosmos Coalition, and we covered the Cosmos 3 models earlier (NVIDIA Cosmos 3: four open world simulation models). Next to the closed Gemini Robotics 2.5, Praxis-1 is the option a university lab or startup can actually download and test on its own robot today.

    By Mikola Máté Patrik

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