LTX Video Models: The Essentials
Last updated: September 16, 2026
The LTX family from Lightricks generates video from a text prompt or a starting image, with sound built into the same pass. The current generation is LTX-2.5: natively multi-shot (one prompt can cut across several connected scenes) and available in a Pro tier for cinematic quality and a Fast tier for longer clips and quicker turnaround, each with a dedicated Audio to Video variant that builds the picture around a music or speech track. The earlier LTX 2.3 series stays available for a few things it still does that 2.5 does not, covered further down.
Which Model Should I Use?
Model | Input | Best for |
Text or image, up to 4K | Default choice for new work: multi-shot storytelling, cinematic camera moves, native audio | |
Text or image, up to 4K | Longer clips (up to 20s), quicker turnaround | |
Audio (up to 10s), up to 4K | Letting a soundtrack or voice performance drive the picture, cinematic quality | |
Audio (up to 20s), up to 4K | Same audio-driven workflow, longer tracks and higher resolution | |
Text or image, up to 4K | A defined end frame, an 8-way named camera motion selector, up to 50 FPS | |
Text or image, up to 4K | Same end-frame and camera controls as 2.3 Pro, at Fast-tier speed | |
2 or more timestamped images | Interpolating between more than two key images in one clip, not just a first and last frame |
LTX-2.5: The Current Generation
LTX-2.5 is natively multi-shot: describe several connected beats in one prompt and the model cuts between them in a single generation, rather than producing one continuous take. Audio is generated in the same pass whenever generateAudio is on, timed to the motion on screen.
LTX-2.5 Pro
The LTX-2.5 Pro model is the quality tier: text-to-video and image-to-video at 720p, 1080p, 1440p, or 4K, 6 to 10 second clips at up to 50 FPS, with an optional closing frame for interpolation.
A matador wearing an ornate red cape stands inside a sandy arena facing a large black bull while a large crowd watches from stadium seats.Text-to-video, dolly right camera move, native audio · Open on Scenario
An astronaut wearing a white spacesuit floats in the vast darkness of outer space, securely tethered by a thin cable to a large metal spacecraft.Text-to-video, static camera · Open on Scenario
A white ceramic cup filled with hot dark coffee sits centrally on a dark textured wooden table, illuminated by soft warm light coming from the side.Image-to-video from a still, dolly in · Open on Scenario
LTX-2.5 Fast
The LTX-2.5 Fast model trades some of Pro's per-frame polish for reach: clips as long as 20 seconds at the same 720p to 4K range as Pro (12 to 20s clips run at 720p or 1080p, 24 or 25 FPS).
A blacksmith wearing a leather apron stands in a dimly lit workshop, holding a hammer to strike glowing hot metal resting upon a sturdy metal anvil.Text-to-video, 14 second clip, dolly in · Open on Scenario
A modern black and white gaming controller rests on a dark textured surface, glowing with bright blue light emanating from the buttons and touch pad.Image-to-video, dolly right · Open on Scenario
A single black basketball shoe with purple accents floats against a dark background, surrounded by glowing purple and blue energy emanating from its patterned sole.Image-to-video, dolly right · Open on Scenario
LTX-2.5 Pro Audio to Video and Fast Audio to Video
The Pro and Fast Audio to Video variants flip the workflow: upload an audio track and it sets the video's length and pacing. Pro accepts up to 10 seconds of audio at up to 4K; Fast accepts up to 20 seconds (audio over 10s renders at 720p or 1080p) and reaches up to 4K on shorter tracks too. Both take an optional prompt or opening image; without an image, a prompt is required.
A man wearing a bright yellow waterproof jacket crouches on the wooden deck of a sailboat while navigating choppy blue waters under a partly cloudy sky.Pro Audio to Video · Open on Scenario
A marching band of young men wearing matching blue uniforms and peaked hats play snare drums while walking down a city street lined with spectators.Pro Audio to Video, drum cadence driving the walk pace · Open on Scenario
A focused woman with dark hair wearing a strapless black dress stands indoors, playing a wooden violin with a bow during a musical performance.Fast Audio to Video, 17 second clip · Open on Scenario
A smiling woman wearing overalls stands in a rustic kitchen, looking down lovingly at freshly baked loaves of bread arranged neatly upon a wooden cutting board.Fast Audio to Video, static camera · Open on Scenario
Parameters
The four LTX-2.5 models share most of these fields; differences are called out per parameter.
prompt
Describes the shot, or shots: LTX-2.5 is natively multi-shot, so a prompt that narrates several connected beats produces a cut between them in one generation, as seen in the matador and blacksmith examples above. Required on Pro and Fast; on the Audio to Video variants it is required only when no opening image is supplied.
audio
Audio to Video only. The soundtrack that drives the clip: its length becomes the video's length. Pro accepts up to 10 seconds; Fast up to 20 seconds. This is what set the pace in the marching band and violinist examples above.
image / lastFrameImage
An opening frame turns any of the four models into image-to-video, as in the coffee cup and gaming controller examples. lastFrameImage adds a closing frame for interpolation and requires an opening frame to be set first.
resolution
Pro supports 720p, 1080p, 1440p, and 4K, always capped at 10 seconds. Fast covers the same four resolutions and allows clips up to 20 seconds, with durations past 10 seconds restricted to 720p or 1080p at 24 or 25 FPS.
duration
Pro: 6, 8, or 10 seconds. Fast: 6 through 20 seconds in 2 second steps, as used for the 14 second blacksmith clip and the 17 second violinist clip above. On the Audio to Video variants, duration follows the audio instead.
aspectRatio
Auto (default), 16:9, or 9:16. Auto follows the opening image when one is set, and falls back to 16:9 for text-only generations.
fps
24 by default. Pro and Fast both offer 25, 48, and 50 FPS at every resolution; on Fast, 48 and 50 FPS cap duration at 10 seconds.
cameraMotion
A preset camera move applied to the shot: dolly in, dolly out, dolly left, dolly right, jib up, jib down, static, or focus shift. Used for the right-dolly in the matador, gaming controller, and basketball shoe examples, and the in-dolly on the coffee cup and blacksmith.
generateAudio
On by default for Pro and Fast: generates synchronized audio in the same pass, timed to the motion on screen. Not exposed on the Audio to Video variants, since the audio is the input rather than an output toggle.
LTX 2.3: Still Available for Specific Needs
LTX 2.3 predates 2.5 but stays on the platform for capabilities 2.5 does not cover: a true end-frame target (not just interpolation from a last-frame image), an 8-way named camera motion selector, and up to 50 FPS.
LTX 2.3 Pro
The LTX 2.3 Pro model takes both a First Frame and an End Frame to direct a specific motion transition, resolves up to 4K at up to 50 FPS, and exposes all eight camera motion presets (Dolly In/Out/Left/Right, Jib Up/Down, Static, Focus Shift) plus 6, 8, or 10 second durations.
LTX 2.3 Fast
The LTX 2.3 Fast model carries the same first/end-frame and camera-motion controls as 2.3 Pro, at Fast-tier speed for rapid prototyping before committing to a longer render.
LTX 2.3 Pro Audio to Video
The LTX 2.3 Pro Audio to Video model predates the 2.5 Audio to Video variants and exposes a Guidance Scale dial (1 to 50, default 5 for text-only and 9 with an image) for how strictly the output follows the prompt, alongside the audio-first workflow: upload 2 to 20 seconds of audio and speech cadence or music shapes the pacing.
One More Option: Keyframes to Video
The LTX-2 19B Keyframes to Video model does one thing none of the models above do: interpolate across more than two key images in a single clip. Pass a list of keyframe images, each with its own timestamp and conditioning strength, and the model animates the transitions between all of them, not just a first and last frame. Useful for a storyboard of 3 or more poses that need to land at specific moments in a 3 to 20 second clip.
Use Cases
Social and ad clips: LTX-2.5 Fast's up-to-20-second, up-to-4K output covers a full vertical or horizontal ad spot with sound in one generation.
Product hero shots: animate a still product photo into a short turntable-style clip with LTX-2.5 Pro image-to-video, as in the coffee cup and controller examples.
Music-driven visuals: feed a finished track into an Audio to Video model to generate a matching performance, as with the violinist and marching band clips.
Multi-beat sequences: LTX-2.5's native multi-shot support turns a single detailed prompt into several connected scenes without stitching clips manually.
Precise start/end transitions: LTX 2.3 Pro or Fast for a shot that must land on a specific end frame.
Storyboard animation: LTX-2 19B Keyframes to Video for animating a sequence of concept poses in order.
Tips for Better Results
Write full scene descriptions, not keywords. Every example above is a complete sentence naming the subject, setting, and lighting; short fragments read as underspecified prompts to the model.
Use multi-shot prompts deliberately on LTX-2.5. Describe each beat in order if the sequence needs distinct scenes; a single-scene prompt keeps the whole clip in one continuous shot.
Match resolution to duration on Fast. Durations past 10 seconds only render at 720p or 1080p, so pick the resolution before locking in a long duration.
Pick a camera motion that matches the subject's energy. Dolly in suits a slow reveal (the coffee cup, the blacksmith); a static camera keeps focus on performance-driven audio clips (the baker).
For Audio to Video, use a clean isolated track. The model reads pacing and energy directly from the waveform, so a track with a clear rhythm drives more legible motion than a busy mix.
Reach for LTX 2.3 Pro when you need a guaranteed end frame, not just an interpolation nudge from a last-frame image.
Keep keyframe counts modest on the 19B Keyframes model. Two or three well-chosen poses interpolate more predictably than a dense sequence.
Known Limitations
Long, high-FPS combinations are restricted. 12 to 20 second clips and 48/50 FPS both cap out at 720p/1080p and 24/25 FPS respectively; they cannot be combined with 4K.
Audio to Video needs either a prompt or an image, not neither. With no opening image, the prompt field becomes required.
LTX-2 19B Keyframes to Video and the older 19B base models are legacy. They are tagged as superseded by the 2.3 and 2.5 generations above; keep using Keyframes to Video only for its unique multi-image interpolation, and prefer 2.5 or 2.3 for everything else.