LTX 2 Fast
4K video at 50fps, up to 20 seconds. LTX 2 Fast combines ultra-high-resolution output with extended clip duration — the longest 4K video generation available on project.video.
What is LTX 2 Fast?
LTX 2 Fast is Lightricks' long-duration 4K video model. Despite the "Fast" naming, the key differentiator is its support for clips up to 20 seconds — significantly longer than most AI video models — at the same 4K resolution and 50fps specifications shared with LTX 2 Pro.
20 seconds of 4K video at 50fps is a substantial generation. This opens up use cases that simply aren't feasible with shorter-format models — long product walkthroughs, extended ambient sequences for background video, and any content where duration at quality matters.
The "Fast" in LTX 2 Fast refers to the underlying generation architecture's speed relative to the quality it delivers — Lightricks positioned it as achieving long-duration 4K output in a generation time that makes the extended runtime practical. For teams needing longer AI video clips at maximum resolution, this model has no direct equivalent among the models available on project.video.
Up to 20 seconds
Longest 4K AI video available
4K resolution
Ultra HD output quality
50fps frame rate
Smooth high-refresh motion
Long-duration ready
Extended scene support
How to generate video with LTX 2 Fast on project.video
Open the composer
Go to your project.video dashboard. LTX 2 Fast is available in the model selector under Lightricks models.
Select LTX 2 Fast
Choose LTX 2 Fast when you need clips longer than 8–10 seconds at 4K quality. It's the only model on project.video that generates 4K video up to 20 seconds.
Write a long-form scene prompt
Describe the full scene — what happens at the start, what develops, how it concludes. At 20 seconds, the model has room to express a complete visual narrative.
Set duration and generate
Choose your duration up to 20 seconds, aspect ratio, and resolution. The longer duration will take more time to generate — plan accordingly for your workflow.
Technical specs
Best use cases
Extended ambient video loops
Generate 20-second 4K ambient sequences — natural scenes, architectural environments, abstract visuals — for use as background video in events, installations, or digital environments.
Long product walkthroughs
Walk through every angle and feature of a product in a single 20-second 4K clip. No need to stitch multiple shorter generations together for comprehensive product videos.
Extended brand film sequences
Brand films benefit from uninterrupted visual sequences. A 20-second continuous 4K clip provides more material to work with in editing than stitching shorter clips.
High-resolution demo reel content
Create demo reel sequences at 4K for use in presentations, pitch decks, or display contexts where quality and duration both matter to the impression.
Example prompts
These prompts use the extended duration of LTX 2 Fast for complete scene development.
"An empty luxury hotel lobby at dawn — over 20 seconds, light gradually increases as sunlight enters through floor-to-ceiling windows, first staff arrive in background, plants and marble detail visible throughout, 16:9"
"Continuous 20-second underwater sequence: a diver descends through a coral reef, fish scatter and regroup, light refracts from the surface above, 4K macro detail on coral texture, 16:9"
"Timelapse-feel sequence: clouds roll over a mountain valley from late afternoon to golden hour over 15 seconds, shadows shift, warm light gradually floods the scene, 16:9"