# Echo-Memory

An action-conditioned world model study from JD that compares four kinds of memory for keeping a generated scene consistent when the camera leaves and comes back. It is built on Wan 2.1 1.3B and released with code, checkpoints and ComfyUI nodes under CC BY 4.0.

Organization: JD Joy Future Academy. Released: 6 June 2026. Kind: Explorable world.

## What you control

- A first frame to start from
- A text prompt
- Camera actions for each chunk of video

## License

Weights: Available (https://huggingface.co/Echo-Team/Echo-Memory). Declared license: CC BY 4.0.
The weights' model card declares CC BY 4.0, a permissive license that allows commercial use. Attribution is required under CC BY 4.0. The checkpoints are fine-tunes of Wan 2.1 1.3B, which is Apache-2.0.

## Real-time

No real-time claim.

## How to run it

1. Download the Wan2.1-T2V-1.3B base model and one of the Echo-Memory checkpoints (context, compression or state-space memory) from Hugging Face.
2. Point the inference script at the base model and a first frame, then generate the video chunk by chunk with camera actions.
3. ComfyUI users can install the project's custom nodes (loader, camera action, generate) from its comfyui folder or the Comfy Registry.

## Where to try

- [Hugging Face Space](https://huggingface.co/spaces/hugging-apps/echo-memory): Browser demo: a first frame, a prompt and a camera action produce a five-second clip.

## Sources

- [Project source](https://github.com/Echo-Team-Joy-Future-Academy-JD/Echo-Memory)
- [Weights and model card](https://huggingface.co/Echo-Team/Echo-Memory)
- [Paper](https://arxiv.org/abs/2606.09803)

## Questions

### Is Echo-Memory open source?

Echo-Memory publishes downloadable weights under CC BY 4.0. The declared license is permissive.

### Can I use Echo-Memory commercially?

The weights' model card declares CC BY 4.0, a permissive license that allows commercial use. Attribution is required under CC BY 4.0. The checkpoints are fine-tunes of Wan 2.1 1.3B, which is Apache-2.0.

### Does Echo-Memory run in real time?

The cited sources do not claim real-time operation.

### Where can I try Echo-Memory?

You can try it on Hugging Face Space.

### What does Echo-Memory take as input?

You give it a first frame to start from, a text prompt and camera actions for each chunk of video.

### How do I run Echo-Memory?

Following the official instructions: Download the Wan2.1-T2V-1.3B base model and one of the Echo-Memory checkpoints (context, compression or state-space memory) from Hugging Face. Point the inference script at the base model and a first frame, then generate the video chunk by chunk with camera actions. ComfyUI users can install the project's custom nodes (loader, camera action, generate) from its comfyui folder or the Comfy Registry.

### What are alternatives to Echo-Memory?

Similar models in this directory include ABot-World (open weights, permissive license), AlayaWorld (open weights, custom terms) and DreamX-World (open weights, permissive license).

Checked 2026-11-03. Corrections: https://github.com/windflow-labs/world-model-directory