Runway Open-Sources Praxis-1, a Robot Model Trained Mostly on Video

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Runway has released Praxis-1, a 27-billion-parameter robot model, with open weights under the permissive Apache 2.0 license. The company reports it scores 46.2% on Nvidia's RoboLab-120 benchmark, ahead of several rival models, though these figures are Runway's own and not yet independently verified. Unlike most robot policies, which rely on costly teleoperated demonstrations, Praxis-1 learns largely from ordinary third-person video, which Runway says works as well as robot-specific footage for training. After fine-tuning on Google's RT-1 robot, which was absent from its training data, the model reportedly reached 80.0% success on SimplerEnv. Runway's claims remain a strong signal pending independent replication, which the open weights now make possible.

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