---
title: LTX-2 | Runware Docs
url: https://runware.ai/docs/models/lightricks-ltx-2
description: Open-source AI video model with synchronized audio and high-fidelity output
---
# LTX-2

LTX-2 is an open-source multimodal video foundation model that generates synchronized video and audio from text or image prompts. It produces high-quality motion sequences with native 4K resolution and smooth temporal coherence, making it suitable for creative video generation, production workflows, and audiovisual storytelling.

- **ID**: `lightricks:ltx@2`
- **Status**: live
- **Creator**: Lightricks
- **Release Date**: January 5, 2026
- **Capabilities**: Text to Video, Image to Video

## Pricing

- **5 seconds**: `$0.15`

## Compatibility & Validation

`width` and `height` must be used together.

## Request Parameters

**API Options**

Platform-level options for task execution and delivery.

### [taskType](https://runware.ai/docs/models/lightricks-ltx-2#request-tasktype)

- **Type**: `string`
- **Required**: true
- **Value**: `videoInference`

Identifier for the type of task being performed

### [taskUUID](https://runware.ai/docs/models/lightricks-ltx-2#request-taskuuid)

- **Type**: `string`
- **Required**: true
- **Format**: `UUID v4`

UUID v4 identifier for tracking tasks and matching async responses. Must be unique per task.

### [outputType](https://runware.ai/docs/models/lightricks-ltx-2#request-outputtype)

- **Type**: `string`
- **Default**: `URL`

Video output type.

**Allowed values**: `URL`

### [outputFormat](https://runware.ai/docs/models/lightricks-ltx-2#request-outputformat)

- **Type**: `string`
- **Default**: `MP4`

Specifies the file format of the generated output. The available values depend on the task type and the specific model's capabilities.

- \`MP4\`: Widely supported video container (H.264), recommended for general use.
- \`WEBM\`: Optimized for web delivery.
- \`MOV\`: QuickTime format, common in professional workflows (Apple ecosystem).

**Allowed values**: `MP4` `WEBM` `MOV`

### [outputQuality](https://runware.ai/docs/models/lightricks-ltx-2#request-outputquality)

- **Type**: `integer`
- **Min**: `20`
- **Max**: `99`
- **Default**: `95`

Compression quality of the output. Higher values preserve quality but increase file size.

### [webhookURL](https://runware.ai/docs/models/lightricks-ltx-2#request-webhookurl)

- **Type**: `string`
- **Format**: `URI`

Specifies a webhook URL where JSON responses will be sent via HTTP POST when generation tasks complete. For batch requests with multiple results, each completed item triggers a separate webhook call as it becomes available.

**Learn more** (1 resource):

- [Webhooks](https://runware.ai/docs/platform/webhooks) (platform)

### [deliveryMethod](https://runware.ai/docs/models/lightricks-ltx-2#request-deliverymethod)

- **Type**: `string`
- **Default**: `async`

Determines how the API delivers task results.

**Allowed values**:

- `async` Returns an immediate acknowledgment with the task UUID. Poll for results using getResponse. Required for long-running tasks like video generation.

**Learn more** (1 resource):

- [Task Polling](https://runware.ai/docs/platform/task-polling) (platform)

### [uploadEndpoint](https://runware.ai/docs/models/lightricks-ltx-2#request-uploadendpoint)

- **Type**: `string`
- **Format**: `URI`

Specifies a URL where the generated content will be automatically uploaded using the HTTP PUT method. The raw binary data of the media file is sent directly as the request body. For secure uploads to cloud storage, use presigned URLs that include temporary authentication credentials.

**Common use cases:**

- **Cloud storage**: Upload directly to S3 buckets, Google Cloud Storage, or Azure Blob Storage using presigned URLs.
- **CDN integration**: Upload to content delivery networks for immediate distribution.

```text
// S3 presigned URL for secure upload
https://your-bucket.s3.amazonaws.com/generated/content.mp4?X-Amz-Signature=abc123&X-Amz-Expires=3600

// Google Cloud Storage presigned URL
https://storage.googleapis.com/your-bucket/content.jpg?X-Goog-Signature=xyz789

// Custom storage endpoint
https://storage.example.com/uploads/generated-image.jpg
```

The content data will be sent as the request body to the specified URL when generation is complete.

### [safety](https://runware.ai/docs/models/lightricks-ltx-2#request-safety)

- **Path**: `safety.checkContent`
- **Type**: `object (2 properties)`

Content safety checking configuration for video generation.

#### [checkContent](https://runware.ai/docs/models/lightricks-ltx-2#request-safety-checkcontent)

- **Path**: `safety.checkContent`
- **Type**: `boolean`
- **Default**: `false`

Enable or disable content safety checking. When enabled, defaults to `fast` mode.

#### [mode](https://runware.ai/docs/models/lightricks-ltx-2#request-safety-mode)

- **Path**: `safety.mode`
- **Type**: `string`
- **Default**: `none`

Safety checking mode for video generation.

**Allowed values**:

- `none` Disables checking.
- `fast` Checks key frames.
- `full` Checks all frames.

### [ttl](https://runware.ai/docs/models/lightricks-ltx-2#request-ttl)

- **Type**: `integer`
- **Min**: `60`

Time-to-live (TTL) in seconds for generated content. Only applies when `outputType` is `URL`.

### [includeCost](https://runware.ai/docs/models/lightricks-ltx-2#request-includecost)

- **Type**: `boolean`
- **Default**: `false`

Include task cost in the response.

### [numberResults](https://runware.ai/docs/models/lightricks-ltx-2#request-numberresults)

- **Type**: `integer`
- **Min**: `1`
- **Max**: `4`
- **Default**: `1`

Number of results to generate. Each result uses a different seed, producing variations of the same parameters.

**Inputs**

Input resources for the task (images, audio, etc). These must be nested inside the \`inputs\` object.

### [frameImages](https://runware.ai/docs/models/lightricks-ltx-2#request-inputs-frameimages)

- **Path**: `inputs.frameImages`
- **Type**: `array of strings or objects`

An array of frame-specific image inputs to guide video generation. Each item can be either a plain image input (UUID, URL, Data URI, or Base64) or an object that pairs an image with a target frame position.

The `frameImages` parameter allows you to constrain specific frames within the video sequence, ensuring that particular visual content appears at designated points. This is different from `referenceImages`, which provide overall visual guidance without constraining specific timeline positions.

When the `frame` parameter is omitted, automatic distribution rules apply:

- **1 image**: Used as the first frame.

**Examples**:

**Shorthand format:** When you don't need to specify a frame position, you can pass a plain image input directly.

```json
"frameImages": [
  "aac49721-1964-481a-ae78-8a4e29b91402"
]
```

**Object format:** When you need to specify a frame position, use an object with `image` and `frame`.

```json
"frameImages": [
  {
    "image": "aac49721-1964-481a-ae78-8a4e29b91402",
    "frame": "first"
  }
]
```

**Format 1: string[]**:

- **Type**: `string`

Image input (UUID, URL, Data URI, or Base64).

**Format 2: object[]**:

#### [image](https://runware.ai/docs/models/lightricks-ltx-2#request-inputs-frameimages-format-2-image)

- **Path**: `inputs.frameImages.image`
- **Type**: `string`
- **Required**: true

Image input (UUID, URL, Data URI, or Base64).

#### [frame](https://runware.ai/docs/models/lightricks-ltx-2#request-inputs-frameimages-format-2-frame)

- **Path**: `inputs.frameImages.frame`
- **Type**: `object`

Target frame position for the image. This model only supports the first frame.

**Allowed values**:

- `first` First frame of the video.
- `0` Frame index 0 (first frame).

**Generation Parameters**

Core parameters for controlling the generated content.

### [model](https://runware.ai/docs/models/lightricks-ltx-2#request-model)

- **Type**: `string`
- **Required**: true
- **Value**: `lightricks:ltx@2`

Identifier of the model to use for generation.

**Learn more** (3 resources):

- [Text To Image: Model Selection The Foundation Of Generation](https://runware.ai/docs/guides/text-to-image#model-selection-the-foundation-of-generation) (guide)
- [Image Inpainting: Model Specialized Inpainting Models](https://runware.ai/docs/guides/image-inpainting#model-specialized-inpainting-models) (guide)
- [Image Outpainting: Other Critical Parameters](https://runware.ai/docs/guides/image-outpainting#other-critical-parameters) (guide)

### [positivePrompt](https://runware.ai/docs/models/lightricks-ltx-2#request-positiveprompt)

- **Type**: `string`
- **Required**: true

Text prompt describing elements to include in the generated output.

**Learn more** (2 resources):

- [Text To Image: Prompts Guiding The Generation](https://runware.ai/docs/guides/text-to-image#prompts-guiding-the-generation) (guide)
- [Image Outpainting: Other Critical Parameters](https://runware.ai/docs/guides/image-outpainting#other-critical-parameters) (guide)

### [negativePrompt](https://runware.ai/docs/models/lightricks-ltx-2#request-negativeprompt)

- **Type**: `string`

Prompt to guide what to exclude from generation. Ignored when guidance is disabled (CFGScale ≤ 1).

**Learn more** (1 resource):

- [Text To Image: Prompts Guiding The Generation](https://runware.ai/docs/guides/text-to-image#prompts-guiding-the-generation) (guide)

### [width](https://runware.ai/docs/models/lightricks-ltx-2#request-width)

- **Type**: `integer`
- **Min**: `128`
- **Max**: `2048`
- **Step**: `64`

Width of the generated media in pixels.

**Learn more** (2 resources):

- [Image To Image: Dimensions Changing Aspect Ratio](https://runware.ai/docs/guides/image-to-image#dimensions-changing-aspect-ratio) (guide)
- [Image Outpainting: Dimensions Critical For Outpainting](https://runware.ai/docs/guides/image-outpainting#dimensions-critical-for-outpainting) (guide)

### [height](https://runware.ai/docs/models/lightricks-ltx-2#request-height)

- **Type**: `integer`
- **Min**: `128`
- **Max**: `2048`
- **Step**: `64`

Height of the generated media in pixels.

**Learn more** (2 resources):

- [Image To Image: Dimensions Changing Aspect Ratio](https://runware.ai/docs/guides/image-to-image#dimensions-changing-aspect-ratio) (guide)
- [Image Outpainting: Dimensions Critical For Outpainting](https://runware.ai/docs/guides/image-outpainting#dimensions-critical-for-outpainting) (guide)

### [duration](https://runware.ai/docs/models/lightricks-ltx-2#request-duration)

- **Type**: `integer`
- **Min**: `1`
- **Max**: `20`

Length of the generated video in seconds. The total number of frames produced is determined by duration multiplied by the model's frame rate (fps).

### [fps](https://runware.ai/docs/models/lightricks-ltx-2#request-fps)

- **Type**: `integer`
- **Min**: `1`
- **Max**: `120`
- **Default**: `25`

Frames per second for video generation. Higher values create smoother motion but require more processing time.

### [steps](https://runware.ai/docs/models/lightricks-ltx-2#request-steps)

- **Type**: `integer`
- **Min**: `1`
- **Max**: `100`
- **Default**: `40`

Total number of denoising steps. Higher values generally produce more detailed results but take longer.

**Learn more** (1 resource):

- [Text To Image: Steps Trading Quality For Speed](https://runware.ai/docs/guides/text-to-image#steps-trading-quality-for-speed) (guide)

### [CFGScale](https://runware.ai/docs/models/lightricks-ltx-2#request-cfgscale)

- **Type**: `float`
- **Min**: `1`
- **Max**: `20`
- **Step**: `0.01`
- **Default**: `4`

Guidance scale representing how closely the output will resemble the prompt. Higher values produce results more aligned with the prompt.

**Learn more** (1 resource):

- [Text To Image: Cfg Scale Balancing Creativity And Control](https://runware.ai/docs/guides/text-to-image#cfg-scale-balancing-creativity-and-control) (guide)

**Settings**

Technical parameters to fine-tune the inference process. These must be nested inside the \`settings\` object.

### [enhancePrompt](https://runware.ai/docs/models/lightricks-ltx-2#request-settings-enhanceprompt)

- **Path**: `settings.enhancePrompt`
- **Type**: `boolean`
- **Default**: `true`

Enable automatic prompt enhancement for cinematic results.

## Response Parameters

### [taskType](https://runware.ai/docs/models/lightricks-ltx-2#response-tasktype)

- **Type**: `string`
- **Required**: true
- **Value**: `videoInference`

Type of the task.

### [taskUUID](https://runware.ai/docs/models/lightricks-ltx-2#response-taskuuid)

- **Type**: `string`
- **Required**: true
- **Format**: `UUID v4`

UUID of the task.

### [videoUUID](https://runware.ai/docs/models/lightricks-ltx-2#response-videouuid)

- **Type**: `string`
- **Required**: true
- **Format**: `UUID v4`

UUID of the output video.

### [videoURL](https://runware.ai/docs/models/lightricks-ltx-2#response-videourl)

- **Type**: `string`
- **Format**: `URI`

URL of the output video.

### [videoBase64Data](https://runware.ai/docs/models/lightricks-ltx-2#response-videobase64data)

- **Type**: `string`

Base64-encoded video data.

### [videoDataURI](https://runware.ai/docs/models/lightricks-ltx-2#response-videodatauri)

- **Type**: `string`
- **Format**: `URI`

Data URI of the output video.

### [seed](https://runware.ai/docs/models/lightricks-ltx-2#response-seed)

- **Type**: `integer`

The seed used for generation. If none was provided, shows the randomly generated seed.

### [NSFWContent](https://runware.ai/docs/models/lightricks-ltx-2#response-nsfwcontent)

- **Type**: `boolean`

Flag indicating if NSFW content was detected.

### [cost](https://runware.ai/docs/models/lightricks-ltx-2#response-cost)

- **Type**: `float`

Task cost in USD. Present when `includeCost` is set to `true` in the request.

## Examples

### Bioluminescent Tidepool Observatory (Text to Video)

[Watch video](https://assets.runware.ai/examples/lightricks-ltx-2/511ec37f-c861-4028-89cb-4359006dc187.mp4)

**Request**:

```json
{
  "taskType": "videoInference",
  "taskUUID": "4d89f0f5-1277-48ee-875d-58e07a4b09d3",
  "model": "lightricks:ltx@2",
  "positivePrompt": "A cinematic night scene on a remote volcanic shoreline transformed into a futuristic tidepool observatory. The camera begins low over black wet rocks as luminous turquoise tide pools pulse like living constellations. Transparent instruments, brass and glass research lanterns, and delicate weather vanes catch the moonlight. In the middle distance, a lone researcher in a weatherproof ivory coat kneels beside a glowing pool while tiny crab-like survey robots leave elegant trails in the sand. A slow forward dolly reveals bioluminescent foam rolling in with each wave, reflections shimmering across polished stone. Overhead, a vast indigo sky with dense stars and a faint green aurora. The surf produces rhythmic motion, soft mist drifts through the frame, and the observatory lights respond subtly to the changing tide. Rich ambient audio: layered ocean waves, crystalline water drips, distant wind through metal chimes, gentle electronic monitoring tones, and a low atmospheric hum. Ultra-detailed, photoreal cinematic lighting, smooth temporal coherence, moody high-end science fantasy production design.",
  "negativePrompt": "blurry, low detail, jittery motion, flicker, duplicate subjects, distorted anatomy, cartoon, text, watermark, logo, harsh overexposure, noisy audio, broken objects, chaotic camera shake",
  "width": 1280,
  "height": 704,
  "duration": 8,
  "fps": 24,
  "steps": 40,
  "CFGScale": 4,
  "settings": {
    "enhancePrompt": true
  }
}
```

**Response**:

```json
{
  "taskType": "videoInference",
  "taskUUID": "4d89f0f5-1277-48ee-875d-58e07a4b09d3",
  "videoUUID": "33c3f183-8546-4c85-8a15-1faab1c8422e",
  "videoURL": "https://vm.runware.ai/video/os/a23d05/ws/5/vi/33c3f183-8546-4c85-8a15-1faab1c8422e.mp4",
  "seed": 1461610484,
  "cost": 0.24
}
```

---

### Bioluminescent Mangrove Night Voyage (Image to Video)

[Watch video](https://assets.runware.ai/examples/lightricks-ltx-2/96526d51-4b4b-404a-a811-856629802b61.mp4)

**Request**:

```json
{
  "taskType": "videoInference",
  "taskUUID": "5282121f-0c07-45f9-8aa4-0563195f89df",
  "model": "lightricks:ltx@2",
  "positivePrompt": "Using the provided first frame as the opening shot, create a cinematic night sequence moving gently forward through luminous mangrove channels. The boat continues drifting through glowing water while mist curls between the roots, tiny bioluminescent insects swirl in layered depth, and distant lantern lights shimmer through the fog. Preserve the framing, subject identity, cloak color, and overall composition of the first frame, then add subtle natural motion: water ripples, soft branch sway, drifting spores, faint reflections, and a gradual reveal of a wider hidden lagoon. Moody, immersive, realistic, poetic, high temporal coherence, elegant camera movement, audiovisual storytelling atmosphere.",
  "negativePrompt": "flicker, jitter, warped anatomy, extra limbs, sudden camera cuts, chaotic motion, oversaturated colors, text, watermark, logo, low detail, blurry subject, duplicated objects, deformed boat, daytime lighting, cartoon style",
  "width": 1536,
  "height": 896,
  "duration": 8,
  "fps": 24,
  "steps": 40,
  "CFGScale": 4.5,
  "settings": {
    "enhancePrompt": true
  },
  "inputs": {
    "frameImages": [
      {
        "image": "https://assets.runware.ai/assets/inputs/edc95535-9838-4f1d-88ee-15a7dd1f7cc6.jpg",
        "frame": "first"
      }
    ]
  }
}
```

**Response**:

```json
{
  "taskType": "videoInference",
  "taskUUID": "5282121f-0c07-45f9-8aa4-0563195f89df",
  "videoUUID": "f77c26ca-e53f-47f5-9943-c8cd18b83de7",
  "videoURL": "https://vm.runware.ai/video/os/a25d05/ws/5/vi/f77c26ca-e53f-47f5-9943-c8cd18b83de7.mp4",
  "seed": 1358884006,
  "cost": 0.24
}
```

---

### Bioluminescent Mangrove Lagoon Nocturne (Text to Video)

[Watch video](https://assets.runware.ai/examples/lightricks-ltx-2/1db2107f-0535-4884-9351-3e005dc844a0.mp4)

**Request**:

```json
{
  "taskType": "videoInference",
  "taskUUID": "2ac0f7a3-e508-45dc-87a1-412fb1430e3b",
  "model": "lightricks:ltx@2",
  "positivePrompt": "A cinematic night voyage through a bioluminescent mangrove lagoon under a crescent moon, low camera gliding just above dark glassy water between twisted roots and arching branches. Electric-blue plankton shimmer in the wake, amber fireflies pulse among hanging vines, translucent jellyfish-like spores drift through humid air, and tiny tree frogs chirp from the shadows. A narrow wooden canoe with woven lanterns passes slowly in the midground, carrying a cloaked botanist with reflective instruments and specimen jars. Gentle ripples, subtle leaf movement, curling mist, moonbeams filtering through the canopy, luminous fish darting beneath the surface, distant thunderclouds on the horizon. Natural, immersive synchronized audio: water lapping, insects, frogs, soft wood creaks, faint wind, occasional distant thunder, delicate crystalline chimes from the glowing spores. Ultra-detailed, dreamlike realism, smooth temporal coherence, moody teal-and-amber palette, cinematic depth, atmospheric volumetric lighting.",
  "negativePrompt": "low resolution, flicker, jitter, duplicated subjects, deformed canoe, extra limbs, text, watermark, logo, overexposed highlights, harsh camera shake, cartoon style, flat lighting, noisy audio, distorted sound",
  "width": 1280,
  "height": 768,
  "duration": 8,
  "fps": 24,
  "steps": 40,
  "CFGScale": 4,
  "settings": {
    "enhancePrompt": true
  }
}
```

**Response**:

```json
{
  "taskType": "videoInference",
  "taskUUID": "2ac0f7a3-e508-45dc-87a1-412fb1430e3b",
  "videoUUID": "3d4059c9-e4b6-41b8-b22c-f49fefb3d02d",
  "videoURL": "https://vm.runware.ai/video/os/a23d05/ws/5/vi/3d4059c9-e4b6-41b8-b22c-f49fefb3d02d.mp4",
  "seed": 561683367,
  "cost": 0.24
}
```