Run Nvidia Cosmos in ComfyUI: Open Source Video Model

Nvidia has released Cosmos, their groundbreaking open-source AI video model that you can now run inside ComfyUI. This powerful video generation tool offers state-of-the-art capabilities with impressive memory efficiency, making it accessible for creators with various hardware setups.

What Makes Nvidia Cosmos Special

Nvidia Cosmos represents a significant advancement in open-source video generation technology. The model comes in two versions: a 7B parameter model (14.5 GB) and a 14B parameter model (28.5 GB). Both versions support text-to-video and video-to-video generation with remarkable consistency and quality.

The efficiency improvements are substantial - Cosmos can run 1280x704 resolution at 121 frames on a 12GB video card, claiming to be 50 times more memory efficient than previous models like Hyun video VAE.

System Requirements and Model Specifications

Before getting started, understand these key requirements:

- Minimum resolution: 704x704
- Fixed frame count: 121 frames (don't change this)
- Maximum resolution: 1280x704
- Long, detailed prompts work best
- Available in both 7B and 14B versions

Setting Up Cosmos in ComfyUI

First, download the workflow file from the provided links. You'll need three essential components:

Text Encoder Setup
Download the text encoder file and place it in your ComfyUI models folder under "text encoders". This component handles prompt processing and understanding.

VAE Installation
Download the VAE file and place it in your models/vae folder. The VAE handles the visual encoding and decoding processes.

Diffusion Models
Download either the text-to-video model, video-to-video model, or both, depending on your needs. Place these files in your models/diffusion models folder.

ComfyUI Update Process

Before running Cosmos, update your ComfyUI installation:

1. Open command prompt in your ComfyUI directory
2. Type "git pull" to update
3. Restart ComfyUI completely
4. Drag and drop the workflow file

Running Your First Generation

Load the workflow and you'll see three main components: the text encoder (CLIP), the VAE loader, and the diffusion model. Choose between text-to-video or video-to-video workflows based on your project needs.

For best results, use detailed prompts. Simple prompts like "cat in hat" may produce inconsistent results. Instead, try something like "a majestic long-haired cat wearing a black top hat, sitting by a window, detailed fur texture, cinematic lighting."

Tips for Better Results

Keep these guidelines in mind:

- Don't modify the frame length (121 frames)
- Start with default settings before experimenting
- Use the lowest resolution (704x704) for faster testing
- Long, descriptive prompts yield better results
- Be patient - generation times can be lengthy

Hardware Considerations

If your local machine struggles with Cosmos, consider cloud solutions. Platforms like Think Diffusion offer 48GB machines specifically designed for running intensive AI models like Cosmos through ComfyUI.

Troubleshooting Common Issues

Failed generations often result from insufficient prompts or hardware limitations. If you experience consistent failures, try:

- Using more detailed prompts
- Reducing resolution temporarily
- Ensuring all model files are properly placed
- Checking that ComfyUI is fully updated

Alternative Platforms

For those seeking a more user-friendly approach to AI video generation, Promptus offers an excellent alternative. Our app and browser-based, cloud-powered visual AI platform simplifies ComfyUI with a no-code interface called CosyFlows. Promptus provides real-time collaboration features, built-in access to advanced models like Gemini Flash and HiDream, Discord integration, and workflow publishing capabilities.

It's particularly valuable for creative teams and solo creators who want ComfyUI's power without the technical complexity.

Be a Creator, Start with Promptus

Nvidia Cosmos represents a major step forward in open-source video generation, offering professional-quality results with impressive efficiency. While setup requires some technical knowledge, the results justify the effort.

Whether you run it locally through ComfyUI or use cloud solutions, Cosmos opens new possibilities for creators seeking high-quality, customizable video generation without relying on closed systems.

For those preferring a more streamlined experience, platforms like Promptus provide modern, accessible alternatives that harness ComfyUI's capabilities through intuitive interfaces.