LTX

LTX Video

LTX 2.5 supports text-to-video and image-to-video generation with synchronized audio. A first frame can establish the opening composition. The free option offers landscape output up to 1280×768 with limited availability and longer generation times. Fast and Pro also support portrait output and optional last-frame guidance: choose Fast for lower-cost iteration and resolutions up to 4K, or Pro for high-fidelity 720p and 1080p output.

How to use this model

  1. 1

    Choose Free for no-cost generation with limited availability, Fast for lower-cost iteration, or Pro for high-fidelity output.

  2. 2

    Write one coherent prompt describing the subject, action, camera movement, lighting, and intended sound.

  3. 3

    Upload a first frame to guide the opening composition; Fast and Pro also accept a last frame.

  4. 4

    Set duration, resolution, and frame rate, then choose any additional controls available for the selected version.

2.5 FastAvailable

LTX 2.5 Fast

LTX 2.5 Fast is designed for rapid video iteration from a text prompt or an optional first frame. Add a last frame when the ending also needs visual guidance, then choose landscape or portrait output, a duration from 2 to 20 seconds, resolution from 720p through 4K, frame rate, and synchronized audio.

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Properties

  • Durations from 2 to 20 seconds with resolutions from 720p through 4K.
  • Text, first-frame, and first/last-frame workflows with optional synchronized audio.

Best for

  • Rapid ideation, storyboarding, and high-volume video generation

Tips

  • Describe subject action, camera movement, lighting, and audio in one coherent scene prompt.

How to use this model

  1. 1

    Write the scene prompt and optionally upload a first frame.

  2. 2

    Add a last frame only together with a first frame when the ending must be fixed.

  3. 3

    Choose duration, resolution, orientation, frame rate, and synchronized audio.

  4. 4

    For clips longer than 10 seconds, use 720p or 1080p at 24 or 25 FPS.

Parameters

Prompt

prompt
Required

Describe the scene, action, camera movement, lighting, and desired audio.

First Frame

image
Optional

Optional image used as the first frame of the generated video.

Last Frame

last_frame_image
Optional

Optional final frame. A first-frame image is required when this is provided.

Duration

duration
Optional
Default: 6

  • 2 seconds

  • 3 seconds

  • 4 seconds

  • 5 seconds

  • 6 seconds

  • 8 seconds

  • 10 seconds

  • 12 seconds

  • 14 seconds

  • 16 seconds

  • 18 seconds

  • 20 seconds

Resolution

resolution
Optional
Default: 1080p

  • 720p

  • 1080p

  • 2K

  • 4K

Aspect Ratio

aspect_ratio
Optional
Default: 16:9

  • 16:9

  • 9:16

Frame Rate

fps
Optional
Default: 24

  • 24 FPS

  • 25 FPS

  • 48 FPS

  • 50 FPS

Generate Audio

generate_audio
Optional

Generate synchronized dialogue, sound effects, and music with the video.

Default: true
2.5 ProAvailable

LTX 2.5 Pro

LTX 2.5 Pro prioritizes final-detail fidelity for text-to-video and image-to-video generation. Use an optional first frame to establish the opening composition and a last frame to guide the ending, then select a 6, 8, or 10 second duration, 720p or 1080p output, landscape or portrait orientation, frame rate, and synchronized audio.

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Properties

  • High-fidelity 720p or 1080p output for 6, 8, or 10 second clips.
  • Text, first-frame, and first/last-frame workflows with optional synchronized audio.

Best for

  • High-fidelity text-to-video and image-to-video generation

Tips

  • Describe subject action, camera movement, lighting, and audio in one coherent scene prompt.

How to use this model

  1. 1

    Write a detailed scene prompt covering action, camera, lighting, and sound.

  2. 2

    Upload a first frame when the opening composition or subject appearance must be preserved.

  3. 3

    Add a last frame only together with a first frame when the ending also needs guidance.

  4. 4

    Choose duration, 720p or 1080p output, orientation, frame rate, and synchronized audio.

Parameters

Prompt

prompt
Required

Describe the scene, action, camera movement, lighting, and desired audio.

First Frame

image
Optional

Optional image used as the first frame of the generated video.

Last Frame

last_frame_image
Optional

Optional final frame. A first-frame image is required when this is provided.

Duration

duration
Optional
Default: 6

  • 6 seconds

  • 8 seconds

  • 10 seconds

Resolution

resolution
Optional
Default: 1080p

  • 720p

  • 1080p

Aspect Ratio

aspect_ratio
Optional
Default: 16:9

  • 16:9

  • 9:16

Frame Rate

fps
Optional
Default: 24

  • 24 FPS

  • 25 FPS

  • 50 FPS

Generate Audio

generate_audio
Optional

Generate synchronized dialogue, sound effects, and music with the video.

Default: true
2.5 · FreeRetired

LTX 2.5 · Free

Subject to limited availability and may take longer.

Properties

  • Free video generation with audio from text and optional image keyframes. Availability is limited and generation may take longer.
  • 512×320, 768×512, or 1280×768 landscape output.

Capabilities

  • The runtime contract provides timeline motion controls.Runtime contract

How to use this model

  1. 1

    Describe the scene, action, camera, lighting, and intended sound.

  2. 2

    Optionally place image keyframes on the timeline and set each image's strength.

  3. 3

    Choose resolution, a requested duration of 1 to 10 seconds, 10 to 30 FPS, and optionally a seed.

Parameters

Prompt

prompt
Required

Subject to limited availability and may take longer.

Image keyframes

keyframes
Optional

Place up to three images on the timeline and set how strongly each guides the video.

Duration

duration
Optional
Default: 2Range: 1 – 10

Resolution

resolution
Optional

Output video dimensions.

Default: 768x512

  • 512×320

  • 768×512

  • 1280×768

FPS

fps
Optional
Default: 30Range: 10 – 30

Seed

seed
Optional
Range: 0 – 4294967295