---
title: SkyReels V4 | Runware Docs
url: https://runware.ai/docs/models/skywork-skyreels-v4
description: Unified multimodal video model for generation, inpainting, and editing with synchronized audio
---
# SkyReels V4

SkyReels V4 is a unified multimodal video foundation model for joint video-audio generation, inpainting, and editing. It accepts text, images, video clips, masks, and audio references, and supports cinematic outputs up to 1080p, 32 FPS, and 15 seconds with synchronized audio, making it suitable for prompt-driven generation as well as guided editing workflows.

- **ID**: `skywork:skyreels@v4`
- **Status**: coming-soon
- **Creator**: Skywork
- **Release Date**: February 25, 2026
- **Capabilities**: Text to Video, Image to Video, Video to Video, Audio to Video

## Pricing

- **Text/image to video . 480p . 1s**: `$0.11`
- **Text/image to video . 720p . 1s**: `$0.140`
- **Text/image to video . 1080p . 1s**: `$0.350`
- **Video to video . 480p . 1s**: `$0.180`
- **Video to video . 720p . 1s**: `$0.250`
- **Video to video . 1080p . 1s**: `$0.625`

## Compatibility & Validation

Either provide `inputs.frameImages` or `inputs.referenceVideos`, or specify `width/height` or `resolution`.

---

When `inputs.referenceImages` includes type `grid`, `inputs.referenceImages` is limited to 1 item.

---

When `inputs.referenceImages` includes type `image`, `inputs.referenceImages` is limited to 3 items.

---

When `inputs.referenceVideos` is provided, `inputs.referenceImages` cannot be used.

---

When `inputs.referenceVideos` includes type `reference`, `settings.audio` cannot be used.

---

`resolution` cannot be used with `width/height`.

---

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

---

The following dimension combinations are supported:

| Configuration | Dimensions |
| --- | --- |
| `480p (16:9)` | `848x480` |
| `480p (9:16)` | `480x848` |
| `480p (~4:3)` | `736x560` |
| `480p (~3:4)` | `560x736` |
| `480p (1:1)` | `640x640` |
| `720p (16:9)` | `1280x720` |
| `720p (9:16)` | `720x1280` |
| `720p (~4:3)` | `1088x832` |
| `720p (~3:4)` | `832x1088` |
| `720p (1:1)` | `960x960` |
| `1080p (16:9)` | `1920x1080` |
| `1080p (9:16)` | `1080x1920` |
| `1080p (~4:3)` | `1664x1248` |
| `1080p (~3:4)` | `1248x1664` |
| `1080p (1:1)` | `1440x1440` |

## Request Parameters

**API Options**

Platform-level options for task execution and delivery.

### [taskType](https://runware.ai/docs/models/skywork-skyreels-v4#request-tasktype)

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

Identifier for the type of task being performed

### [taskUUID](https://runware.ai/docs/models/skywork-skyreels-v4#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/skywork-skyreels-v4#request-outputtype)

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

Video output type.

**Allowed values**: `URL`

### [outputFormat](https://runware.ai/docs/models/skywork-skyreels-v4#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/skywork-skyreels-v4#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/skywork-skyreels-v4#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/skywork-skyreels-v4#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/skywork-skyreels-v4#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/skywork-skyreels-v4#request-safety)

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

Content safety checking configuration for video generation.

#### [checkContent](https://runware.ai/docs/models/skywork-skyreels-v4#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/skywork-skyreels-v4#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/skywork-skyreels-v4#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/skywork-skyreels-v4#request-includecost)

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

Include task cost in the response.

### [numberResults](https://runware.ai/docs/models/skywork-skyreels-v4#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.

### [referenceImages](https://runware.ai/docs/models/skywork-skyreels-v4#request-inputs-referenceimages)

- **Path**: `inputs.referenceImages`
- **Type**: `array of objects (4 properties)`

Reference image groups for subject, scene, style, or collage-based guidance. All items must share the same type.

#### [type](https://runware.ai/docs/models/skywork-skyreels-v4#request-inputs-referenceimages-type)

- **Path**: `inputs.referenceImages.type`
- **Type**: `string`
- **Required**: true

Reference mode for this group.

**Allowed values**:

- `grid` Single collage image.
- `image` Subject, scene, or style reference.

#### [audio](https://runware.ai/docs/models/skywork-skyreels-v4#request-inputs-referenceimages-audio)

- **Path**: `inputs.referenceImages.audio`
- **Type**: `string`

Audio input (UUID or URL). Voice timbre reference for lip-sync. Max 15 seconds.

#### [images](https://runware.ai/docs/models/skywork-skyreels-v4#request-inputs-referenceimages-images)

- **Path**: `inputs.referenceImages.images`
- **Type**: `array of strings`
- **Required**: true

Image inputs (UUID, URL, Data URI, or Base64) for this reference group.

#### [tag](https://runware.ai/docs/models/skywork-skyreels-v4#request-inputs-referenceimages-tag)

- **Path**: `inputs.referenceImages.tag`
- **Type**: `string`
- **Required**: true

Group identifier that links this reference to a mention in the prompt. Must start with @ (e.g. @actor1, @style).

### [frameImages](https://runware.ai/docs/models/skywork-skyreels-v4#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.
- **2 images**: First and last frames.
- **3+ images**: First and last frames, with intermediate images evenly spaced between.

**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"
  }
]
```

**First and last frames:** With two images, they automatically become the first and last frames of the video sequence. You can mix shorthand and object formats.

```json
"frameImages": [
  "aac49721-1964-481a-ae78-8a4e29b91402",
  {
    "image": "3ad204c3-a9de-4963-8a1a-c3911e3afafe",
    "frame": "last"
  }
]
```

**Multiple frames:** With three or more images, the first and last are anchored while intermediate frames are evenly distributed across the timeline.

```json
"frameImages": [
  {
    "image": "aac49721-1964-481a-ae78-8a4e29b91402",
    "frame": "first"
  },
  "c00abf5f-6cdb-4642-a01d-1bfff7bc3cf7",
  {
    "image": "3ad204c3-a9de-4963-8a1a-c3911e3afafe",
    "frame": "last"
  }
]
```

**Format 1: string[]**:

- **Type**: `string`

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

**Format 2: object[]**:

#### [image](https://runware.ai/docs/models/skywork-skyreels-v4#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/skywork-skyreels-v4#request-inputs-frameimages-format-2-frame)

- **Path**: `inputs.frameImages.frame`
- **Type**: `string | integer`

Target frame position for the image. Accepts a named position like `first` or `last`, or a zero-based frame index (-1 for the last frame).

### [referenceVideos](https://runware.ai/docs/models/skywork-skyreels-v4#request-inputs-referencevideos)

- **Path**: `inputs.referenceVideos`
- **Type**: `array of objects (3 properties)`

Reference video for motion guidance, subject replacement, editing, or video extension.

#### [type](https://runware.ai/docs/models/skywork-skyreels-v4#request-inputs-referencevideos-type)

- **Path**: `inputs.referenceVideos.type`
- **Type**: `string`
- **Required**: true

Reference mode for the video.

**Allowed values**:

- `reference` Motion reference, subject replacement, or editing. Input video audio is carried to output.
- `extend` Video extension.

#### [tag](https://runware.ai/docs/models/skywork-skyreels-v4#request-inputs-referencevideos-tag)

- **Path**: `inputs.referenceVideos.tag`
- **Type**: `string`
- **Required**: true

Video reference identifier that links to a mention in the prompt. Must start with @ (e.g. @video1).

#### [video](https://runware.ai/docs/models/skywork-skyreels-v4#request-inputs-referencevideos-video)

- **Path**: `inputs.referenceVideos.video`
- **Type**: `string`
- **Required**: true

Video input (UUID or URL). Max 15 seconds. Minimum 1,866,240 total pixels (e.g. 1920×972).

**Generation Parameters**

Core parameters for controlling the generated content.

### [model](https://runware.ai/docs/models/skywork-skyreels-v4#request-model)

- **Type**: `string`
- **Required**: true
- **Value**: `skywork:skyreels@v4`

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/skywork-skyreels-v4#request-positiveprompt)

- **Type**: `string`
- **Required**: true
- **Max**: `5120`

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)

### [width](https://runware.ai/docs/models/skywork-skyreels-v4#request-width)

- **Type**: `integer`
- **Paired with**: height

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/skywork-skyreels-v4#request-height)

- **Type**: `integer`
- **Paired with**: width

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)

### [resolution](https://runware.ai/docs/models/skywork-skyreels-v4#request-resolution)

- **Type**: `string`
- **Default**: `1080p`

Resolution preset for the output. When used with input media, automatically matches the aspect ratio from the input.

**Allowed values**: `480p` `720p` `1080p`

### [duration](https://runware.ai/docs/models/skywork-skyreels-v4#request-duration)

- **Type**: `float`
- **Min**: `3`
- **Max**: `15`
- **Default**: `5`

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).

**Settings**

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

### [audio](https://runware.ai/docs/models/skywork-skyreels-v4#request-settings-audio)

- **Path**: `settings.audio`
- **Type**: `boolean`
- **Default**: `false`

Sound effect generation for the output video.

### [promptExtend](https://runware.ai/docs/models/skywork-skyreels-v4#request-settings-promptextend)

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

Automatic prompt expansion and refinement via LLM for higher visual fidelity and alignment.

## Response Parameters

### [taskType](https://runware.ai/docs/models/skywork-skyreels-v4#response-tasktype)

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

Type of the task.

### [taskUUID](https://runware.ai/docs/models/skywork-skyreels-v4#response-taskuuid)

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

UUID of the task.

### [videoUUID](https://runware.ai/docs/models/skywork-skyreels-v4#response-videouuid)

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

UUID of the output video.

### [videoURL](https://runware.ai/docs/models/skywork-skyreels-v4#response-videourl)

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

URL of the output video.

### [videoBase64Data](https://runware.ai/docs/models/skywork-skyreels-v4#response-videobase64data)

- **Type**: `string`

Base64-encoded video data.

### [videoDataURI](https://runware.ai/docs/models/skywork-skyreels-v4#response-videodatauri)

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

Data URI of the output video.

### [seed](https://runware.ai/docs/models/skywork-skyreels-v4#response-seed)

- **Type**: `integer`

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

### [NSFWContent](https://runware.ai/docs/models/skywork-skyreels-v4#response-nsfwcontent)

- **Type**: `boolean`

Flag indicating if NSFW content was detected.

### [cost](https://runware.ai/docs/models/skywork-skyreels-v4#response-cost)

- **Type**: `float`

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