Run a free AI video model with sound on your own computer

LTX-2.5 turns a prompt or a picture into video with sound made in the same pass. It runs in ComfyUI with ready-made templates.

ModelLTX-2.5 by Lightricks (open weights, 22B parameters)

DownloadsOver 2 million last month on Hugging Face

DoesText or image to video, sound in the same pass, multishot scenes, up to 4K

LicenseLTX-2.x Community License: free incl. commercial use under $10M yearly revenue

Checked on 23 Oct 2026. Tools change fast, so the official page always wins if it says something different.

What you need first

1An NVIDIA graphics cardOfficial minimum: 32 GB VRAM, 32 GB RAM, 100 GB free disk, CUDA 12.7+. Quantized versions (fp8/int8/NVFP4) and CPU offload help on smaller cards but run slower.

2ComfyUIFree app. Install it or update to the latest version.

Step by step

Install or update ComfyUI

Get it from comfy.org. The official LTX-2.5 templates ship with the latest version.

Open the template

In ComfyUI open Templates and pick the LTX-2.5 text-to-video or image-to-video template. Let it download the model files (pick a quantized version if your card is smaller).

Write your prompt

Describe the scene, the camera and the sound. Put spoken lines in quotes so it makes voices, and describe sounds (rain, footsteps, crowd) so it adds them.

Run it

Press Queue. For 4K use the template's upscaling pipeline. Prefer no nodes? LTX Desktop (ltx.io) is an easier app.

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The catch

Needs a strong NVIDIA card. The official minimum is 32 GB of VRAM; smaller cards work with quantized checkpoints but slower. Mac and AMD aren't officially covered.
Short clips. Examples are around 5 seconds; 4K uses an upscaling step and is heavy.
License. Free incl. commercial use for organisations under $10M yearly revenue; above that you need a paid license.
Real people. Don't generate real people without their consent.

Official links

Model on Hugging Face ↗Model page ↗ComfyUI nodes ↗Docs ↗ComfyUI ↗

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Unnerd AI · I'm not linked to Lightricks, I just think it's useful.