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LTX-2.5 is Lightricks’ open-weights video and world model, available in ComfyUI through the LTX-2.5 API nodes. The API workflows run generation on Lightricks’ servers, so no model downloads or local GPU is required, and each second of generated video is billed to your Comfy API account. The LTX-2.5 API offers two model tiers: LTX-2.5 (Pro) for maximum quality, and LTX-2.5 (Fast) for faster generation with the distilled model. Both tiers support synchronized audio and video generation with native multishot scenes, and output up to 4K resolution on the Fast tier.
To use the Partner Nodes, you need to ensure that you are logged in properly and using a permitted network environment. Please refer to the Partner Nodes Overview section of the documentation to understand the specific requirements for using the Partner Nodes.
Make sure your ComfyUI is updated.Workflows in this guide can be found in the Workflow Templates. If you can’t find them in the template, your ComfyUI may be outdated.If nodes are missing when loading a workflow, possible reasons:
  1. You are not using the latest ComfyUI version (Nightly version)
  2. Some nodes failed to import at startup

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LTX-2.5 API workflows

The template library ships with three API example workflows:
  • Text to Video: Generate videos from text prompts
  • Image to Video: Generate videos from a single start image
  • FLF2V: Generate a video between a first and last frame image

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LTX-2.5 Text to Video

Generate videos from text prompts through the LTX-2.5 API, with synchronized audio.

Run in Comfy Cloud

Open in Comfy Cloud

Download Workflow

Download JSON or search “LTX-2.5 T2V” in Template Library

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Prompting tips

  1. Model: Choose LTX-2.5 (Pro) for the highest quality, or LTX-2.5 (Fast) for faster generation
  2. Duration: Pro supports 2-10 seconds; Fast supports 2-20 seconds. Durations over 10 seconds require a 720p or 1080p resolution and 24/25 FPS
  3. Resolution and ratio: Choose a resolution preset such as 1280x720 (landscape) or 720x1280 (portrait); Fast adds 2560x1440 and 3840x2160 options
  4. FPS: Choose between 24, 25, 48, or 50 FPS on Fast, and 24, 25, or 50 FPS on Pro
  5. Audio: Audio generation is on by default; disable it in the node’s advanced settings if you only need a silent video
  6. Prompt: Describe the whole scene in one flowing paragraph, including the shot, action, characters, camera movement, and the audio you want

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LTX-2.5 Image to Video

Generate a video from a single start image through the LTX-2.5 API, with synchronized audio.

Run in Comfy Cloud

Open in Comfy Cloud

Download Workflow

Download JSON or search “LTX-2.5 I2V” in Template Library

Input Image: space_battle.png

Start frame for the workflow, or use your own image.

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Prompting tips

  1. Model: This workflow ships with LTX-2.5 (Fast) selected for faster iteration; switch to LTX-2.5 (Pro) for maximum quality
  2. Single image only: The image input accepts exactly one start image
  3. Prompt: Describe what happens next: the motion, camera movement, and sounds that follow from the start image. Phrasing like “Use the provided start image as the first frame” helps anchor the generation
  4. Duration and resolution: The Fast tier supports up to 20 seconds and resolutions up to 4K; durations over 10 seconds require 720p/1080p at 24/25 FPS

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LTX-2.5 FLF2V

Generate a video between a first and last frame image through the LTX-2.5 API, blending both frames into a single animated sequence.

Run in Comfy Cloud

Open in Comfy Cloud

Download Workflow

Download JSON or search “LTX-2.5 FLF2V” in Template Library

First Frame: porsche_car_01.png

First frame of the video.

Last Frame: porsche_car_02.png

Last frame of the video, connected to the last_frame input of the node.

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Prompting tips

  1. Frames: The workflow connects the first image to the image input and the second image to the last_frame input; the model generates the motion between them
  2. Keep frames aligned: Use images with the same aspect ratio for a smooth interpolation
  3. Model: This workflow ships with LTX-2.5 (Pro) selected; switch to LTX-2.5 (Fast) for faster generation
  4. Prompt: Describe the transition between the frames, and the audio (dialogue, SFX, music) you want