# comma.ai world model 4B

comma.ai's 4B driving world model predicts what the car's two cameras will see next, together with a driving plan, from recent frames and the car's own motion. comma uses it as a simulator to train openpilot driving policies with reinforcement learning; the weights are MIT.

Organization: comma.ai. Released: 1 September 2026. Kind: Driving.

## What you control

- Recent camera frames
- The car's ego motion
- Future anchors for the driving plan

## License

Weights: Available (https://huggingface.co/commaai/worldmodel-4B). Declared license: MIT.
The weights' model card declares MIT, a permissive license that allows commercial use. Check what the model was built on, because a base model's terms can still apply.

## Real-time

No real-time claim.

## Where to try

No hosted destination verified.

## Sources

- [Weights and model card](https://huggingface.co/commaai/worldmodel-4B)
- [Paper](https://arxiv.org/abs/2504.19077)
- [comma.ai blog](https://blog.comma.ai/mlsim/)

## Questions

### Is comma.ai world model 4B open source?

comma.ai world model 4B publishes downloadable weights under MIT. The declared license is permissive.

### Can I use comma.ai world model 4B commercially?

The weights' model card declares MIT, a permissive license that allows commercial use. Check what the model was built on, because a base model's terms can still apply.

### Does comma.ai world model 4B run in real time?

The cited sources do not claim real-time operation.

### Where can I try comma.ai world model 4B?

No hosted version was verified; run the published weights yourself.

### What does comma.ai world model 4B take as input?

You give it recent camera frames, the car's ego motion and future anchors for the driving plan.

### What are alternatives to comma.ai world model 4B?

Similar models in this directory include Oasis 3 (no public weights, service terms), Orbis (open weights, permissive license) and Orbis 2 (open weights, permissive license).

Checked 2026-10-23. Corrections: https://github.com/windflow-labs/world-model-directory