LTX 2 Pro: Text-to-Video 4K, Audio Sync, Pro Control

ltx/ltx-2/pro/text-to-video

Generate high-fidelity, cinematic videos from text and image inputs using Lightricks' LTX 2 Pro, featuring up to 2160p resolution and integrated audio generation.

Prompt *

A photorealistic portrait of a stylish young woman sitting at an outdoor Parisian café with red woven bistro chairs and circular white tables. She has long, smooth, straight, honey-blonde hair, parted neatly in the middle. She is wearing a classic black beret, a crisp white button-up shirt, and a dark blue tie with diagonal gold stripes. Over her shirt, she wears a slightly oversized black leather jacket. She accessorizes with pearl and gold hoop earrings on one ear. Her makeup features sharp, winged eyeliner, defined eyebrows, and a natural nude lip color, giving her a chic, confident look. The scene captures a soft afternoon ambient light, with clear reflections on the glass window behind her. Through the window, vintage-style golden lettering that reads "ROYH..." is visible, partially cut off due to her posture. In the background, a Parisian street is subtly mirrored in the glass. The camera angle is eye-level, front-facing and slightly to the right, creating a natural, elegant composition. The color palette is warm and clean with a touch of Parisian café ambience. Extremely detailed, 8k resolution, sharp focus, shallow depth of field, photorealistic style, natural lighting, cinematic atmosphere, high fashion editorial aesthetic, 4K film grain.

Duration

Duration of the generated video in seconds.

Resolution

Resolution of the generated video.

Aspect Ratio (W:H)

Aspect ratio of the generated video.

Frames Per Second

Frames per second of the generated video.

Generate Audio

Whether to generate audio for the generated video.

Idle

The rate is $0.06 per second for 1080p, $0.12 per second for 1440p, and $0.24 per second for 2160p.

Introduction to LTX 2 Pro

LTX 2 Pro is the flagship text-to-video generation model by Lightricks, designed to deliver cinematic high-resolution video clips with synchronized audio for professional creators and production teams. For developers, LTX 2 Pro on RunComfy can be used both in the browser and via an HTTP API, so you don’t need to host or scale the model yourself.

Model overview

Provider

Lightricks

Task

High-fidelity text-to-video generation with image conditioning

Architecture

Advanced Diffusion Transformer (DiT) optimized for temporal consistency and photorealism

Resolution

Supports high-definition outputs up to 2160p (4K)

Key strengths

Cinematic Quality: Produces broadcast-ready video with realistic lighting and motion.
Audio Integration: Native capabilities to generate synchronized audio alongside video.
High Frame Rates: Supports smooth motion up to 50 FPS.
Precise Control: Utilizes both text prompts and input images for granular control over the generated scene.

LTX 2 represents the next evolution in generative video technology. It excels at understanding complex prompt instructions and maintaining subject consistency across frames. The "Pro" variant on RunComfy is tuned for maximum quality and detail, making it ideal for final production assets.

Capabilities and Variants

RunComfy hosts the full suite of LTX 2 capabilities. While this page features the Pro Text-to-Video workflow, you can explore other specialized modes:

For animating static images into video, use LTX 2 Pro Image-to-Video.
For faster iteration and lower latency, try LTX 2 Fast Text-to-Video or LTX 2 Fast Image-to-Video.
To refine and edit existing clips, use LTX 2 Retake Video.

How LTX 2 runs on RunComfy

On RunComfy, LTX 2 is hosted as a managed ComfyUI graph and exposed in three complementary ways:

Playground UI

Input your text prompt, upload a reference image, adjust resolution and FPS, and generate videos directly in your browser.

Ideal for verifying prompts and testing different aesthetic styles before scaling up.

Workflow API

From the playground or workflow view, you can deploy the model as an API and call it from your own apps or services.

This provides a private, production-ready endpoint matching the exact configuration of the Pro model.

In all cases, inference runs on RunComfy’s high-performance cloud GPUs—no local hardware, drivers, or downloads needed.

Input parameters

The LTX 2 Pro interface accepts specific parameters to control the video generation process.

Core Inputs

The image_url is a required string parameter (accepting formats like JPG, PNG, or WEBP) that serves as the initial image to condition the video generation, acting as the starting frame or style reference. The prompt is also a required string parameter used to provide a narrative description of the video content, movement, and atmosphere. Additionally, the generate_audio boolean parameter (true or false) determines whether to automatically generate sound effects and ambience matching the video content.

Video Settings

The resolution string parameter defines the output quality with options for 1080p, 1440p, or 2160p; higher resolutions take longer but provide clearer details. The duration integer sets the length of the video in seconds, with typical values of 6, 8, or 10. You can control the frame rate via the fps integer, choosing 25 for a cinematic look or 50 for smoother motion. Finally, the aspect_ratio string determines the dimensions of the generated video, which is currently optimized for widescreen 16:9.

Recommended settings

Cinematic Scenes

For movie-like results, use 25 FPS, 1080p or 1440p, and enable generate_audio. Ensure your prompt describes camera movement (e.g., "slow dolly in", "pan right") to guide the motion effectively.

High-Motion Action

For sports or fast-paced scenes, increase to 50 FPS to reduce motion blur. Use a shorter duration (6s) to maintain coherence during rapid movement.

High-Fidelity Production

Select 2160p (4K) resolution. Note that generation time will increase, but the output will be suitable for large-screen viewing.

Output quality and performance

LTX 2 Pro is optimized for quality over raw speed.

On RunComfy, expect:

Resolution: Crystal clear outputs up to 4K.
Coherence: Excellent temporal stability with minimal flickering or morphing artifacts.
Audio: Surprisingly accurate soundscapes that align with visual cues (e.g., city noise, footsteps).

Recommended use cases

LTX 2 Pro excels where visual fidelity is paramount:

Marketing & Advertising

Create high-resolution B-roll, product reveals, and social media ads that require a polished, professional look.

Content Creation

Generate background scenes, visualizers for music, or narrative clips for YouTube and short-form content.

Pre-visualization

Filmmakers can use the Pro model to storyboard complex scenes with high accuracy before shooting.

How LTX 2 Pro compares to other models

LTX 2 Pro vs LTX 2 Fast

Pro: Focuses on maximum resolution (up to 4K), higher step counts, and detail retention. Best for final exports.
Fast: Optimized for speed and lower latency. Best for rapid prototyping or real-time applications. Check out the Fast variant here.

LTX 2 vs Competitors

Compared to older diffusion video models, LTX 2 offers superior prompt adherence and native audio generation, reducing the need for external sound effect tools.

Official resources and ecosystem

Official LTX Video Code

https://github.com/Lightricks/LTX-Video

Hugging Face Model Card

https://huggingface.co/Lightricks/LTX-Video

License and commercial usage

LTX 2 (LTX Video) is generally available under the OpenRAIL-++ license (or specific terms set by Lightricks). Users are responsible for ensuring their generated content complies with the license terms, particularly regarding commercial applications.

Disclaimer: This summary is for informational purposes. Please consult the official Lightricks documentation for the most up-to-date licensing information.

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Frequently Asked Questions

What is the LTX 2 model and how does it differ from previous video generation models?

LTX 2 is a next-generation open-source video foundation model built by Lightricks. Unlike older U-Net based models, LTX 2 utilizes a Latent DiT (Diffusion Transformer) architecture. This allows it to process complex semantic prompts more effectively, resulting in higher fidelity, better motion coherence, and fewer artifacts in text-to-video generation.

Can I use LTX 2 generated videos for commercial projects?

Yes. LTX 2 is released under an open permissive license. When you generate videos using RunComfy's LTX 2 Pro Text-to-Video playground or API, you own the commercial rights to the output, making it suitable for advertising, film production, and social media content.

How can developers integrate LTX 2 Text-to-Video into their applications?

RunComfy offers a production-ready Serverless API for LTX 2. Developers can access the Pro Text-to-Video endpoint to generate high-quality videos without managing GPU infrastructure. The API supports scalable concurrency and provides predictable pricing based on generation time.

What is the best way to write prompts for LTX 2 Pro?

For optimal results with LTX 2, use a structured prompting method: Subject + Action + Environment + Camera Movement + Style. For example: "A cyberpunk robot (Subject) walking through rain (Action) in a neon-lit alley (Environment), slow pan up (Camera), cinematic 4k (Style)."

RunComfy

RunComfy is the premier ComfyUI platform, offering ComfyUI online environment and services, along with ComfyUI workflows featuring stunning visuals. RunComfy also provides AI Models, enabling artists to harness the latest AI tools to create incredible art.

LTX 2 Pro: Text-to-Video 4K, Audio Sync, Pro Control | RunComfy

Generate high-fidelity, cinematic videos from text and image inputs using Lightricks' LTX 2 Pro, featuring up to 2160p resolution and integrated audio generation.

Introduction to LTX 2 Pro