# Runway details Praxis-1, a 27B video and action model, in a technical report

> Original title: Praxis-1 is a 27B-parameter mixture-of-experts diffusion transformer that predicts video and actions together. We detail the model's arch...

- Source: Runway
- Published: 2026-11-11T15:04:25.000Z
- Bad Influence: https://badinfluence.news/items/zhkjq2kscp2ooc46ncy0o6dqf
- Original: https://x.com/runwayml/status/2120533108017791460

## Summary

Runway says Praxis-1 is a 27B-parameter mixture-of-experts diffusion transformer that predicts video and actions together. The company says its technical report covers the model's architecture, training stages and results.

## Why it matters

The post gives the model's scale and joint video and action prediction design, which helps readers see how video pretraining connects to robot control.

## Post

Praxis-1 is a 27B-parameter mixture-of-experts diffusion transformer that predicts video and actions together. We detail the model's architecture, training stages and results in our technical report.

https://runway.com/research/praxis-1-video-pretraining-to-robot-control