lightricks/ltx-2.5-fast

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Fast video generation with text-to-video and image-to-video, portrait and landscape support, synchronized audio, and frame interpolation. Up to 20 seconds at 1080p, and 4K resolution.

Capabilities

Reference Images

Cost

Community model (estimated from hardware time)

Input Parameters

Name	Type	Description	Default	Constraints
`prompt`*	string	Text prompt describing the video to generate	`—`	—
`aspect_ratio`	string	Aspect ratio of the generated video	`"16:9"`	16:99:16
`duration`	integer	Duration of the video in seconds. Durations longer than 10 seconds are only available at 720p or 1080p resolution with 24 or 25 FPS. 48/50 FPS caps at 10 seconds.	`6`	234568101214161820
`fps`	integer	Frame rate in frames per second	`25`	24254850
`generate_audio`	boolean	Generate audio for the video. Used for text_to_video and image_to_video tasks.	`true`	—
`image`	string(uri)	First frame image for image-to-video generation	`—`	—
`last_frame_image`	string(uri)	Last frame image for image-to-video generation. When provided, the video interpolates between the first frame and this last frame.	`—`	—
`resolution`	string	Resolution quality of the generated video. Higher resolutions cap the maximum duration.	`"1080p"`	720p1080p2k4k

promptrequiredstring

Text prompt describing the video to generate

aspect_ratiostring

Aspect ratio of the generated video

Default: "16:9"

16:99:16

durationinteger

Duration of the video in seconds. Durations longer than 10 seconds are only available at 720p or 1080p resolution with 24 or 25 FPS. 48/50 FPS caps at 10 seconds.

Default: 6

234568101214161820

fpsinteger

Frame rate in frames per second

Default: 25

24254850

generate_audioboolean

Generate audio for the video. Used for text_to_video and image_to_video tasks.

Default: true

imagestring

First frame image for image-to-video generation

last_frame_imagestring

Last frame image for image-to-video generation. When provided, the video interpolates between the first frame and this last frame.

resolutionstring

Resolution quality of the generated video. Higher resolutions cap the maximum duration.

Default: "1080p"

720p1080p2k4k

Version: 52475fac89a8Updated: 9/20/2026303 runs