LTX 2.5 Fast
Lightricks · AI videoLTX 2.5 Fast is the speed-optimized variant of Lightricks’ LTX-2.5 video model. It generates clips with synchronized audio for rapid prototyping, mobile workflows, and high-volume production.
It supports text-to-video and image-to-video, including start-and-end frame interpolation. On VidMachine it runs via Protoface at 480p (1 credit/s) or 720p (2 credits/s).
Key features and benefits
Fast generation with native audio
Optimized for turnaround. When generate_audio is on (VidMachine always enables it), output includes synchronized sound.
Text to video and image to video
Describe the clip in a prompt, or pass a first-frame image to animate that still. An optional last frame interpolates between start and end.
Selectable resolution
Choose 480p or 720p in project settings. Higher resolution costs more credits per second of output.
Technical specifications
Developer / familyLightricks LTX-2.5 Fast
Resolution on VidMachine480p or 720p (project model setting)
Duration2, 3, 4, 5, 6, 8, 10, 12, 14, 16, 18, or 20 seconds (snapped to the nearest allowed length)
Aspect ratio16:9 or 9:16
Frame rate25 fps on VidMachine (allows clips up to 20s)
Pricing on VidMachine1 credit/s at 480p; 2 credits/s at 720p
Use cases and applications
Iterate quickly on short cinematic shots, social ads, and scene motion where speed and cost matter.
Animate a generated start frame, or interpolate between start and end frames when both are available.
Why this model
Choose LTX 2.5 Fast when you want a low-cost Protoface model with native audio, clips up to 20 seconds, and a 480p vs 720p price tradeoff.
How VidMachine uses it
VidMachine calls lightricks/ltx-2.5-fast on Protoface with synchronized audio. Scene pipelines pass the starting frame as image and an optional last frame. Aspect ratio is 16:9 or 9:16 from the project setting.
Choose 480p or 720p in project settings. Billing is 1 credit per second at 480p and 2 credits per second at 720p.
What you should know
Does LTX 2.5 Fast require a starting image?
No. Text-to-video works from a prompt. When a starting frame is available, VidMachine sends it as the first-frame image.
What resolutions are available on VidMachine?
480p at 1 credit per second and 720p at 2 credits per second. Higher resolutions are not selectable.
How long can a clip be?
Up to 20 seconds. Allowed lengths are 2, 3, 4, 5, 6, then even numbers through 20. Other targets are snapped to the nearest allowed duration.