---
title: Veo 3.1 Fast | Runware Docs
url: https://runware.ai/docs/models/google-veo-3-1-fast
description: High speed Google Veo 3.1 Fast text to video generation
---
# Veo 3.1 Fast

Veo 3.1 Fast is a high speed variant of Veo 3.1 for rapid creative iteration. It supports text prompts, image prompts, and reference images. It targets low latency workflows while keeping cinematic quality for short form and multi shot video generation with native audio.

- **ID**: `google:3@3`
- **Status**: live
- **Creator**: Google
- **Release Date**: October 15, 2025
- **Capabilities**: Text to Video, Image to Video

## Pricing

Each generation will cost $0.1/s for 1080p, or $0.15/s for 1080p with audio.

- **1080p · 8s**: `$0.8`
- **1080p · 8s (with audio)**: `$1.2`
- **4K · 8s**: `$2.40`
- **4K · 8s (with audio)**: `$2.80`

## Compatibility & Validation

Provide exactly one of: `inputs.frameImages` or `width/height`.

---

When `inputs.video` is provided, `width/height`, `seed`, and `resolution` cannot be used.

---

When `inputs.video` is provided, `duration` must be `7`.

---

When `providerSettings.google.resizeMode` is provided, `inputs.frameImages` requires at least 1 item.

---

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

---

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

---

The following dimension combinations are supported:

| Configuration | Dimensions |
| --- | --- |
| `720p (16:9)` | `1280x720` |
| `720p (9:16)` | `720x1280` |
| `1080p (16:9)` | `1920x1080` |
| `1080p (9:16)` | `1080x1920` |
| `4K (16:9)` | `3840x2160` |
| `4K (9:16)` | `2160x3840` |

## Request Parameters

**API Options**

Platform-level options for task execution and delivery.

### [taskType](https://runware.ai/docs/models/google-veo-3-1-fast#request-tasktype)

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

Identifier for the type of task being performed

### [taskUUID](https://runware.ai/docs/models/google-veo-3-1-fast#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/google-veo-3-1-fast#request-outputtype)

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

Video output type.

**Allowed values**: `URL`

### [outputFormat](https://runware.ai/docs/models/google-veo-3-1-fast#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/google-veo-3-1-fast#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/google-veo-3-1-fast#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/google-veo-3-1-fast#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/google-veo-3-1-fast#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/google-veo-3-1-fast#request-safety)

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

Content safety checking configuration for video generation.

#### [checkContent](https://runware.ai/docs/models/google-veo-3-1-fast#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/google-veo-3-1-fast#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/google-veo-3-1-fast#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/google-veo-3-1-fast#request-includecost)

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

Include task cost in the response.

### [numberResults](https://runware.ai/docs/models/google-veo-3-1-fast#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/google-veo-3-1-fast#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.

**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"
  }
]
```

**Format 1: string[]**:

- **Type**: `string`

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

**Format 2: object[]**:

#### [image](https://runware.ai/docs/models/google-veo-3-1-fast#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/google-veo-3-1-fast#request-inputs-frameimages-format-2-frame)

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

Target frame position for the image. Supports first and last frame.

**Allowed values**:

- `first` First frame of the video.
- `last` Last frame of the video.
- `0` Frame index 0 (first frame).
- `-1` Frame index -1 (last frame).

### [video](https://runware.ai/docs/models/google-veo-3-1-fast#request-inputs-video)

- **Path**: `inputs.video`
- **Type**: `string`

Video to extend (UUID or URL).

**Generation Parameters**

Core parameters for controlling the generated content.

### [model](https://runware.ai/docs/models/google-veo-3-1-fast#request-model)

- **Type**: `string`
- **Required**: true
- **Value**: `google:3@3`

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/google-veo-3-1-fast#request-positiveprompt)

- **Type**: `string`
- **Required**: true
- **Min**: `2`
- **Max**: `3000`

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/google-veo-3-1-fast#request-width)

- **Type**: `integer`
- **Required**: true
- **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/google-veo-3-1-fast#request-height)

- **Type**: `integer`
- **Required**: true
- **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/google-veo-3-1-fast#request-resolution)

- **Type**: `string`

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

**Allowed values**: `720p` `1080p` `4K`

### [duration](https://runware.ai/docs/models/google-veo-3-1-fast#request-duration)

- **Type**: `float`
- **Default**: `8`

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).

**Allowed values**: `7` `8`

### [seed](https://runware.ai/docs/models/google-veo-3-1-fast#request-seed)

- **Type**: `integer`
- **Min**: `0`
- **Max**: `4294967295`

Random seed for reproducible generation. When not provided, a random seed is generated in the unsigned 32-bit range.

**Provider Settings**

Parameters specific to this model provider. These must be nested inside the \`providerSettings.google\` object.

### [enhancePrompt](https://runware.ai/docs/models/google-veo-3-1-fast#request-providersettings-google-enhanceprompt)

- **Path**: `providerSettings.google.enhancePrompt`
- **Type**: `boolean`
- **Value**: `true`

Enable automatic prompt enhancement. Affects reproducibility. Always active for Veo 3.1 Fast.

### [generateAudio](https://runware.ai/docs/models/google-veo-3-1-fast#request-providersettings-google-generateaudio)

- **Path**: `providerSettings.google.generateAudio`
- **Type**: `boolean`
- **Default**: `true`

Generate video with synchronized audio including ambient sounds and music.

### [resizeMode](https://runware.ai/docs/models/google-veo-3-1-fast#request-providersettings-google-resizemode)

- **Path**: `providerSettings.google.resizeMode`
- **Type**: `string`

Resize mode for the input media.

**Allowed values**: `crop` `pad`

## Response Parameters

### [taskType](https://runware.ai/docs/models/google-veo-3-1-fast#response-tasktype)

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

Type of the task.

### [taskUUID](https://runware.ai/docs/models/google-veo-3-1-fast#response-taskuuid)

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

UUID of the task.

### [videoUUID](https://runware.ai/docs/models/google-veo-3-1-fast#response-videouuid)

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

UUID of the output video.

### [videoURL](https://runware.ai/docs/models/google-veo-3-1-fast#response-videourl)

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

URL of the output video.

### [videoBase64Data](https://runware.ai/docs/models/google-veo-3-1-fast#response-videobase64data)

- **Type**: `string`

Base64-encoded video data.

### [videoDataURI](https://runware.ai/docs/models/google-veo-3-1-fast#response-videodatauri)

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

Data URI of the output video.

### [seed](https://runware.ai/docs/models/google-veo-3-1-fast#response-seed)

- **Type**: `integer`

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

### [NSFWContent](https://runware.ai/docs/models/google-veo-3-1-fast#response-nsfwcontent)

- **Type**: `boolean`

Flag indicating if NSFW content was detected.

### [cost](https://runware.ai/docs/models/google-veo-3-1-fast#response-cost)

- **Type**: `float`

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

## Examples

### Tethered Airship Repair Approach (Image to Video)

[Watch video](https://assets.runware.ai/examples/google-veo-3-1-fast/52a52576-9f61-43bf-973c-117539c6184d.mp4)

**Request**:

```json
{
  "taskType": "videoInference",
  "taskUUID": "03dfc4bf-b344-457a-8154-833484348cf1",
  "model": "google:3@3",
  "positivePrompt": "Extend the provided video seamlessly. Continue the slow forward camera movement as the cargo airship nears a narrow gap between colossal sandstone spires high above a cloud layer. A mechanic in a patched amber flight coat steps carefully onto the outer rigging and secures a snapping cable while fabric sails strain in the wind. The ship creaks, metal rings vibrate, loose tools rattle, and distant birds circle below. As the cable is fastened, the vessel stabilizes and glides through the gap, revealing a vast aerial caravan route with several far-off balloon craft crossing the horizon. Preserve continuity with the original clip's lighting, lens feel, weathered textures, and motion. Emphasize cinematic realism, expressive environmental sound, layered depth, and smooth continuation rather than a cut to a different scene.",
  "inputs": {
    "video": "https://assets.runware.ai/assets/inputs/45f88540-c9cf-42c2-867b-154adbd6fa3d.mp4"
  }
}
```

**Response**:

```json
{
  "taskType": "videoInference",
  "taskUUID": "03dfc4bf-b344-457a-8154-833484348cf1",
  "videoUUID": "210c57ac-af0b-4e18-971c-3cd1ededc6eb",
  "videoURL": "https://vm.runware.ai/video/os/a13d12/ws/5/vi/210c57ac-af0b-4e18-971c-3cd1ededc6eb.mp4",
  "seed": 1812099483,
  "cost": 1.2
}
```

---

### Submerged Grand Library Ruins (Text to Video)

[Watch video](https://assets.runware.ai/examples/google-veo-3-1-fast/5a163b1e-094f-49a1-9e54-b0cb16d60b31.mp4)

**Request**:

```json
{
  "taskType": "videoInference",
  "taskUUID": "495ff489-3a06-4576-93e0-ab9f2541798d",
  "model": "google:3@3",
  "positivePrompt": "A sweeping cinematic dive through the flooded remains of an ancient grand library beneath clear turquoise water. Towering stone shelves lean at odd angles, thousands of swollen books drift slowly upward, marble busts are wrapped in waving seagrass, and shafts of sunlight ripple through a cracked glass dome overhead. A school of silver fish parts as the camera glides forward between columns carved with faded maps and constellations. Loose pages spin in the current, a brass globe rests half buried in sand, and tiny air bubbles trail past the lens. Midway through the shot, a giant sea turtle crosses the hall, stirring sediment into glowing golden haze. End on a wide reveal of the entire submerged archive with broken staircases, collapsed balconies, and distant whale-song ambience. Natural underwater acoustics, creaking stone, soft currents, rustling paper, graceful cinematic realism, high detail, volumetric light, atmospheric depth.",
  "width": 1920,
  "height": 1080,
  "duration": 8,
  "seed": 17459,
  "providerSettings": {
    "google": {
      "enhancePrompt": true,
      "generateAudio": true
    }
  }
}
```

**Response**:

```json
{
  "taskType": "videoInference",
  "taskUUID": "495ff489-3a06-4576-93e0-ab9f2541798d",
  "videoUUID": "30800434-15be-44ca-b6ae-959d8edc3702",
  "videoURL": "https://vm.runware.ai/video/os/a14d18/ws/5/vi/30800434-15be-44ca-b6ae-959d8edc3702.mp4",
  "seed": 17459,
  "cost": 1.2
}
```

---

### Salt-Flat Mirror Caravan (Image to Video)

[Watch video](https://assets.runware.ai/examples/google-veo-3-1-fast/f23f661b-b1ba-4e86-8aa6-4639d49532a6.mp4)

**Request**:

```json
{
  "taskType": "videoInference",
  "taskUUID": "05c662a9-bf1f-4e42-adf5-62f0fad90598",
  "model": "google:3@3",
  "positivePrompt": "Using the provided first-frame image as the opening shot, create a cinematic sequence across a reflective salt flat at sunrise. The caravan advances slowly toward camera-left while ripples spread through the thin water layer, banners flutter in gusts, dangling metal charms clink softly, and the animals leave delicate wakes in the mirrored surface. One traveler adjusts a scarf, another turns to look toward distant crystal outcrops catching the early light. The camera begins low and gliding, then eases into a gentle lateral tracking move that emphasizes reflections and scale. Atmosphere is serene, expansive, and slightly otherworldly, with realistic motion, natural fabric physics, subtle dust and mist, shimmering heat distortion, and rich environmental detail. Include synchronized ambient audio: soft wind, hoof splashes, harness creaks, faint chimes, no dialogue, no subtitles.",
  "width": 1920,
  "height": 1080,
  "duration": 8,
  "seed": 55844,
  "providerSettings": {
    "google": {
      "enhancePrompt": true,
      "generateAudio": true,
      "resizeMode": "crop"
    }
  },
  "inputs": {
    "frameImages": [
      {
        "image": "https://assets.runware.ai/assets/inputs/5e55bec0-030a-4322-aeab-e81e064cfd39.jpg",
        "frame": "first"
      }
    ]
  }
}
```

**Response**:

```json
{
  "taskType": "videoInference",
  "taskUUID": "05c662a9-bf1f-4e42-adf5-62f0fad90598",
  "videoUUID": "e6495281-fa8a-4bc7-9d97-709a44752a69",
  "videoURL": "https://vm.runware.ai/video/os/a13d12/ws/5/vi/e6495281-fa8a-4bc7-9d97-709a44752a69.mp4",
  "seed": 55844,
  "cost": 1.2
}
```

---

### Windblown Cliffside Falconer Camp (Image to Video)

[Watch video](https://assets.runware.ai/examples/google-veo-3-1-fast/b7168785-28f5-4016-a5d9-0c7c29493ca6.mp4)

**Request**:

```json
{
  "taskType": "videoInference",
  "taskUUID": "9c007fe8-e414-42f1-9549-41222e995b01",
  "model": "google:3@3",
  "positivePrompt": "Starting from the provided first frame, create a cinematic 8-second shot of a cliffside falconer camp above a restless ocean at golden hour. The camera makes a slow forward drift with slight lateral movement. The falconer remains the focal subject while the bird blinks, shifts its weight, ruffles feathers, and briefly spreads one wing against the wind. Canvas tents tug and ripple, ribbons whip sharply, grass bends in gusts, smoke trails from a fire, and pack animals make subtle natural movements in the background. Far below, waves crash against rock faces with visible spray. Preserve grounded realism, tactile fabrics, weathered gear, believable anatomy, and cohesive lighting. Emphasize sweeping atmosphere, layered depth, and documentary-style cinematic detail. Generate synchronized audio with wind gusts, cloth flapping, distant surf, soft camp creaks, and occasional falcon chirps.",
  "width": 1920,
  "height": 1080,
  "duration": 8,
  "seed": 49053,
  "providerSettings": {
    "google": {
      "enhancePrompt": true,
      "generateAudio": true,
      "resizeMode": "crop"
    }
  },
  "inputs": {
    "frameImages": [
      {
        "image": "https://assets.runware.ai/assets/inputs/1d985e16-2bea-48f4-8983-04a1ae64d337.jpg",
        "frame": "first"
      }
    ]
  }
}
```

**Response**:

```json
{
  "taskType": "videoInference",
  "taskUUID": "9c007fe8-e414-42f1-9549-41222e995b01",
  "videoUUID": "c6fc50d7-b625-46e5-b10b-75ff5bcad9b7",
  "videoURL": "https://vm.runware.ai/video/os/a19d05/ws/5/vi/c6fc50d7-b625-46e5-b10b-75ff5bcad9b7.mp4",
  "seed": 49053,
  "cost": 1.2
}
```