video model · by Lightricks
LTX-2 Fast AI Video Generator
Generate videos up to 20 seconds long at 1080p with synchronized audio using LTX-2 Fast - Lightricks' open-source DiT-based audio-video foundation model. Built for creators who want longer clips, unified sound, and the flexibility of an open model, now available inside Fliki.
Generated with LTX-2 Fast
A handful of LTX-2 Fast clips generated inside Fliki. No edits, no post.
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What makes LTX-2 Fast distinct
Unified audio-video foundation
LTX-2 is a DiT (diffusion transformer) based audio-video foundation model - it generates synchronized video and audio in a single pass, instead of generating video and then overlaying sound.
Up to 20-second generations
LTX-2 Fast can produce clips up to 10 seconds long at 2160p - longer than most AI video models. Use the runway for narrative beats, ambient atmosphere, or extended product demos.
1080p output
LTX-2 Fast renders at 1080p, delivering social-ready quality without needing an upscale pass. The output holds detail across the full 10-second duration.
Synchronized native audio
Every LTX-2 clip comes with synchronized audio - ambient sound, effects, and music that align with on-screen action. Audio is part of the model's core, not an afterthought.
Open-source transparency
LTX-2 is open source, which means the model weights and inference code are publicly available. For Fliki users that translates into a model with an active research community and continuous third-party improvements.
Text-to-video, image-to-video, multi-modal
LTX-2 Fast supports text, image, and audio inputs across text-to-video, image-to-video, and audio-conditioned generation. The open architecture allows for unusually flexible input combinations.
Community-backed model evolution
Because LTX-2 is open source, improvements from Lightricks and third-party contributors show up fast. Expect a higher rate of quality improvements over time than with closed models.
ComfyUI and local-inference compatibility
The underlying LTX-2 weights are compatible with ComfyUI and local inference for advanced users. On Fliki, you get the same model through a simple prompt interface - no local setup needed.
Apache 2.0 license
LTX-2 ships under the Apache 2.0 license — full model weights, training code, and documentation are publicly released. That license is friendly to commercial work and is rare among production-grade video models.
How it works
How to generate a video with LTX-2 Fast
LTX-2 Fast runs inside Fliki's standard generator. Here's the flow.

Write your prompt
LTX-2 Fast handles extended durations well, so write prompts with a beginning, middle, and end. Describe the narrative arc, not just the subject.

Select LTX-2 Fast as your model
Pick LTX-2 Fast from Fliki's model selector. Your prompt is sent to the Lightricks open-source model for generation.

Pick your aspect ratio
Choose 16:9 for landscape, 9:16 for vertical social, or 1:1 for square feed. LTX-2 Fast composes each ratio natively.

Set the duration
LTX-2 Fast supports up to 20 seconds - use the extended runway for narrative, atmosphere, and extended shot beats. Shorter durations generate faster.

Add a reference image or audio (optional)
Upload an image to anchor the subject or an audio clip to drive timing and mood. LTX-2's multi-modal input handling is part of what makes it unusually flexible.

Select resolution and generate
Choose 1080p, 1440p or 2160p and hit Generate. Your clip arrives in Fliki with synchronized audio baked in.
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LTX-2 Fast FAQ
Frequently asked questions
Everything you need to know about generating with LTX-2 Fast inside Fliki.
What is LTX-2 Fast?
LTX-2 Fast is Lightricks' open-source DiT-based audio-video foundation model. It generates up to 10 seconds of 1080p video with synchronized native audio, supporting text-to-video, image-to-video, and multi-modal workflows.
Is LTX-2 Fast open source?
Yes. LTX-2 is an open-source model - weights and inference code are publicly available, with an active developer and research community. On Fliki, you get hosted access with no local setup required.
What is the LTX-2 model?
LTX-2 is Lightricks' audio-video foundation model, released in late 2025, built on a diffusion transformer (DiT) architecture that generates synchronized audio and video in a single pass.
How long can LTX-2 Fast videos be?
LTX-2 Fast supports clips up to 10 seconds and 2160p - better resolution quality than most current AI video models.
Does LTX-2 Fast generate audio?
Yes. Synchronized native audio is one of LTX-2's core features, generated as part of the same model pass as the video.
What's the difference between LTX-2 Fast and LTX-2.3?
Fast prioritizes generation speed and is the production speed tier. LTX-2.3 is the latest generation tuned for maximum fidelity, sharper motion, and final delivery. Use Fast for iteration and volume; use LTX-2.3 for hero shots and final output.
Still curious?
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Start freeCan LTX-2 Fast do image-to-video?
Yes. Text, image, and audio inputs are all supported. Image-to-video is strong for controlled continuation and style consistency.
Do I need ComfyUI to use LTX-2 Fast?
No. ComfyUI works for local inference on the open-source weights, but inside Fliki LTX-2 Fast runs through a standard prompt interface - no local setup or ComfyUI required.
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Up to 20 seconds of 1080p video with synchronized native audio. Open-source power, hosted inside Fliki.
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