lightricks/ltx-2.5-fast

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.

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LTX 2.5 Fast

LTX 2.5 Fast is the speed-optimized variant of Lightricks’ LTX-2.5 video generation model. It generates videos with synchronized audio quickly — good for rapid prototyping, mobile workflows, and high-volume production.

It supports both text-to-video and image-to-video, including start-and-end frame interpolation.

Inputs

Input Description Default
prompt Text description of the video to generate (required)
image First frame image for image-to-video None
last_frame_image End frame for interpolation (requires image) None
resolution Video resolution: 720p, 1080p, 2k, or 4k 1080p
duration Length in seconds: 2, 3, 4, 5, 6, 8, 10, 12, 14, 16, 18, or 20 6
aspect_ratio 16:9 (landscape) or 9:16 (portrait) 16:9
fps Frame rate: 24, 25, 48, or 50 25
generate_audio Generate synchronized audio true

Durations longer than 10 seconds are only available at 720p or 1080p with 24 or 25 FPS. At 48 or 50 FPS the maximum duration is 10 seconds.

Output

MP4 video file with synchronized audio (when generate_audio is enabled).

Prompting tips

  • Write one continuous paragraph in present tense
  • Be specific about camera angles, lighting, and movement
  • Include atmospheric details: lighting quality, weather, textures
  • Describe actions with active verbs: “walks”, “pans slowly”, “zooms in”
  • Longer, more detailed prompts produce better results

Image-to-video

Pass a first frame with image. To generate a video that transitions between two frames, also pass last_frame_image. The last_frame_image input requires image to be set.

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