Running the LTX 2.3 Open Video Model Locally with ComfyUI on an RTX 3090

Melvin Vivas · X video post · 2026-04-13 · 0:05 · 290 views · Open on X

Topics: AI Dev Tools & Productivity, Industry Trends & Job Market · Level: intermediate

Summary

This is a short demo post. Melvin Vivas shows LTX 2.3, the open video-generation model from LTX Studio (Lightricks), running locally and for free in ComfyUI. One generation took about 5 minutes on a consumer RTX 3090 GPU. He says he hasn't yet worked out how to control the audio in the output. The post shows that open video models can run on a home GPU, but it doesn't give the workflow steps.

Key points

• LTX 2.3 is an open video-generation model from LTX Studio (Lightricks) that you can run locally at no cost.
• ComfyUI, a node-based interface for generative models, was used to run the model.
• One generation took about 5 minutes on an NVIDIA RTX 3090 (24 GB VRAM), a consumer GPU.
• The model produces audio along with the video, but the creator hadn't yet worked out how to control it.
• Running open models locally avoids per-generation API costs. You pay with generation time and need a strong GPU.

Resources mentioned

• ComfyUI · tool · x.com · free
  The official X account for ComfyUI, the node-based tool for generative AI workflows, which announces things like ComfyUI Agent.
  Also in: ComfyUI Agent: early access announcement (Melvin Vivas on X · notes), Comfy Router: One API for Image, Video, 3D and Audio Model Providers (Melvin Vivas on X · notes), Generating AI Video Locally with MiniMax H3 in ComfyUI on an RTX 3090 (Melvin Vivas on X · notes), Running MiniMax M3 Locally in ComfyUI on an RTX 3090 (Melvin Vivas on X · notes) and 23 more
• LTX 2.3 · tool · huggingface.co · free
  A video generation model from LTX (Lightricks) that makes video from text or images, including start- and end-frame image-to-video, with audio, portrait output and 24/48 fps.
  Also in: Free Local AI Video Generation with LTX 2.3 in ComfyUI (Melvin Vivas on X · notes), Local Video Generation with LTX 2.3 on an RTX 3090 (Melvin Vivas on X · notes), AI Video Generation Locally with ComfyUI and LTX 2.3 (Melvin Vivas on X · notes), LTX 2.3 Image-to-Video Running Locally (Demo) (Melvin Vivas on X · notes) and 3 more
• LTX Studio · tool · ltx.studio · check price
  A browser-based AI video production platform that now runs on LTX-2.3 and covers the creative workflow from first frame to final delivery.
  Also in: Seedance 2.0 Video Model Now Available in LTX Studio (1080p) (Melvin Vivas on X · notes), Local Image-to-Video with LTX 2.3 in ComfyUI and Z-Image (Melvin Vivas on X · notes), LTX-2.3 Launch: Fast Native 4K AI Video Generation in LTX Studio (Melvin Vivas on X · notes)

Try this

• Set up ComfyUI on a local GPU, run LTX 2.3 to generate short videos, and test ways to control the generated audio.