> ## Documentation Index
> Fetch the complete documentation index at: https://docs.vast.ai/llms.txt
> Use this file to discover all available pages before exploring further.
# Generating Video with LTX-2.3 and ComfyUI
[LTX-2.3](https://huggingface.co/Lightricks/LTX-2.3) is the first open-source model that generates synchronized video and audio together in a single pass. Built by Lightricks, this 22B-parameter Diffusion Transformer doesn't just create video — it produces matching audio at the same time, whether that's dialogue with lip-synced characters, ambient soundscapes, or music-driven visuals.
What makes it stand out:
* **Joint audio-video generation** — no need to generate video and audio separately and try to sync them
* **Multiple generation modes** — text-to-video, image-to-video, audio-conditioned video, and keyframe interpolation
* **Fast inference** — the distilled pipeline generates in just 8 denoising steps
* **Open source** — full model weights available on HuggingFace, trainable with LoRA in under an hour
Running LTX-2.3 requires a powerful GPU. Vast.ai gives you on-demand access to the hardware you need, and the pre-built ComfyUI template means you can go from zero to generating videos in minutes — no CLI, SSH, or manual setup required.
## Find and rent your GPU
1. **Setup your Vast account and add credit:** Review the [quickstart guide](/documentation/get-started/quickstart) if you do not have an account with credits loaded.
2. **Deploy the LTX-2.3 template:** Go to the [LTX-2.3 model page](https://vast.ai/model/ltx-2-3) and click **Deploy Now**. This takes you to the Vast console with the LTX-2.3 ComfyUI template pre-selected.
3. **Select a GPU:** Choose an instance from the list and click **Rent**.
## Wait for provisioning
After renting, the instance automatically downloads all required model weights. You'll see a loading screen while models download. On a fast connection this takes just a few minutes. Once complete, the instance status shows a green **Running** indicator.
## Open ComfyUI
Click the **Open** button on your instance to launch the Instance Portal. Click **Launch Application** under **ComfyUI** to open the visual workflow editor.
In the left sidebar under **Workflows > Browse**, you'll see four pre-loaded workflows:
| Workflow | Description |
| -------------------- | -------------------------------- |
| `video_ltx2_3_t2v` | Text-to-Video |
| `video_ltx2_3_i2v` | Image-to-Video |
| `video_ltx2_3_ia2v` | Image + Audio-to-Video |
| `video_ltx2_3_flf2v` | First & Last Frame Interpolation |
## Text-to-Video
Select **video\_ltx2\_3\_t2v** from the sidebar. Enter a descriptive prompt in the **Video Generation** node — describe camera angles, lighting, and motion cinematically. Adjust width, height, and frame count if desired (defaults: 1280x720, 121 frames, 25 fps). Click **Run**.
The workflow includes automatic prompt enhancement powered by Gemma 3, which expands short prompts into detailed cinematic descriptions.
## Image-to-Video
Select **video\_ltx2\_3\_i2v**. Upload a reference image in the **Load Image** node (a sample Egyptian queen image is included). Enter a prompt describing how the image should come to life. Click **Run**. The model uses your image as the first frame and generates consistent motion.
## Image + Audio-to-Video
Select **video\_ltx2\_3\_ia2v**. Upload a reference image and an audio file (a sample MP3 is included). Enter a prompt describing the scene. Click **Run**. The model generates video synchronized to the audio — lip movements match dialogue, and scene energy follows the audio's rhythm.
## First & Last Frame Interpolation
Select **video\_ltx2\_3\_flf2v**. Load two images — a first frame and a last frame (sample car images are included). Enter a prompt describing the transition. Click **Run**. The model generates a smooth video interpolation between your two keyframes.
## Cleanup
When finished, go to the [Vast.ai console](https://cloud.vast.ai/instances/) and click **Delete** on your instance to stop charges.
## Resources
* [LTX-2.3 on HuggingFace](https://huggingface.co/Lightricks/LTX-2.3)
* [LTX-2 GitHub Repository](https://github.com/Lightricks/LTX-2)
* [Vast.ai Model Page](https://vast.ai/model/ltx-2-3)