LTX-2.3 Pro Text to Video: 4K Clips From a Prompt
Last verified: October 19, 2026
LTX-2.3 Pro turns a written prompt into a video clip of up to 4K. Its soundtrack is generated together with the picture, not added afterwards. You direct the action, the camera and the sound in one text box, and you get back a shot framed vertical or widescreen, depending on how you set it up.
Pro is the higher-fidelity variant of LTX-2.3, and LTX-2.3 closely follows descriptions of timing, motion and expression. So it rewards prompts written like a shot description (who does what, where the camera sits, what the light and sound are doing) over a string of adjectives, because concrete direction is what carries through into the clip.
The settings around the prompt cover delivery: clip length, resolution, vertical or widescreen framing, frame rate, and whether the model generates sound at all. Enhance Prompt sits under the text box and turns a rough idea into a fuller scene. A good way to work is to settle the wording on lower-resolution drafts and save the 4K render for the version you'll publish.
Explore more text to video
LTX-2.3 Pro Settings at a Glance
The input, clip options and output you work with on every run.
Input
A text prompt of up to 2,048 characters
Video Duration
6, 8 or 10 seconds
Resolution
1080P, 2K or 4K
Aspect Ratio
9:16, 16:9
Audio
Switch on or off, on by default
Output
1 video per run
Prompting Techniques for Better LTX-2.3 Pro Clips
Start the Prompt With the Action, Then Layer Detail
Place Subjects and the Camera Explicitly
Use One Craft's Vocabulary to Set the Style
How to Make a Video With LTX-2.3 Pro
Four steps from a written prompt to a downloaded clip.
LTX-2.3 Pro or LTX-2.3 Fast for Your Clip
How Pro compares with LTX-2.3 Fast, the other tier Lightricks offers for writing a clip from a prompt.
| Criterion | LTX-2.3 Pro | Alternatives | Best For |
|---|---|---|---|
| Longest single take | Pro's single-generation ceiling matches the longest Video Duration option, and that ceiling is the same at every resolution Lightricks lists for Pro. | LTX-2.3 Fast, offered through Lightricks' own API, stretches one generation to 20 seconds at 1080p and holds to 10 seconds at 1440p and 4K. | Choose Fast when you need one unbroken take longer than ten seconds and 1080p is enough; stay with Pro when the shot fits within its length. |
| Stage of production | Lightricks positions Pro for final, commercial-grade renders with higher detail and motion stability. | Lightricks positions LTX-2.3 Fast for rapid iteration, storyboards and previews. | Use Fast to storyboard many variations and Pro for the take that goes into the final edit, which follows the creator's own advice to start on Fast and ship on Pro. |
Common LTX-2.3 Pro Problems and How to Fix Them
Problems that show up in generated clips, and what to change before the next run.
My video looks like a still photo and almost nothing moves.
My longer clips rush through the action and then drift.
Fast action like flips or juggling comes out warped or glitchy.
In busy scenes, characters merge, swap looks or get lost.
The audio has sounds I didn't ask for, or doesn't fit the scene.
Frequently Asked Questions
How long can an LTX-2.3 Pro video be?
Lightricks caps Pro at ten seconds per generation at every resolution it supports, and that's also the longest Video Duration option here. For a longer piece, plan it as a sequence of shots and give each prompt enough action to fill its own clip.
Can LTX-2.3 Pro make characters speak?
Yes. Lightricks presents LTX-2.3 as having built-in native dialogue, and its prompt guide explains how to direct a line. Break the speech into short phrases, put an acting direction between each one, and describe physical cues (a pause, a glance to the side, a voice that cracks) instead of labels like sad or nervous. Keep Generate Audio on so the voice is created with the clip.
Why does one generation cost more than another?
The credit cost is calculated from the options you pick and shown above the Generate button once you're signed in. It changes with Video Duration and Resolution, so check the figure after adjusting either one. Enhance Prompt does not use credits.
Is 4K worth it, or is 1080P enough?
Render the final take at 4K when the clip will play on large screens or be cropped in the edit, since the extra resolution gives you room to reframe. For drafts, 1080P is a fair preview: LTX-2.3's rebuilt VAE produces sharper detail at every resolution, and Lightricks notes that if you've been sharpening or upscaling in post to compensate, you should need less of that.
Which FPS setting should I use?
The higher frame rates exist for smoother motion. Pick the higher FPS option for fast camera moves or footage you plan to slow down later, because the extra frames let you play it at half speed on a timeline running at the default rate. For dialogue, slow drama and most social clips, the default gives a conventional look and is the simpler place to start.