# Veo 3.1 Fast

> Faster and more cost effective version of Google's Veo 3.1!

## Overview

- **Endpoint**: `https://api.runflow.io/v1/run/google/veo3.1/fast`
- **Model ID**: `google/veo3.1/fast`
- **Provider**: Google
- **License**: commercial
- **Last Updated**: 2026-04-06

## Pricing

- **Base price**: $0.15/second
- **Note**: Usage-based, per seconds
## Input Schema

### `prompt` (string, required)

The text prompt describing the video you want to generate

### `auto_fix` (boolean, optional)

Whether to automatically attempt to fix prompts that fail content policy or other validation checks by rewriting them.
- **Default**: `true`

### `duration` (string, optional)

The duration of the generated video.
- **Default**: `8s`
- **Options**: `4s`, `6s`, `8s`

### `generate_audio` (boolean, optional)

Whether to generate audio for the video.
- **Default**: `true`

### `resolution` (string, optional)

The resolution of the generated video.
- **Default**: `720p`
- **Options**: `720p`, `1080p`, `4k`

### `aspect_ratio` (string, optional)

Aspect ratio of the generated video
- **Default**: `16:9`
- **Options**: `16:9`, `9:16`

### `safety_tolerance` (string, optional)

The safety tolerance level for content moderation. 1 is the most strict (blocks most content), 6 is the least strict.
- **Default**: `4`
- **Options**: `1`, `2`, `3`, `4`, `5`, `6`

### `seed` (integer, optional)

The seed for the random number generator.

### `negative_prompt` (string, optional)

A negative prompt to guide the video generation.

## Usage Examples

### cURL

```bash
curl -X POST https://api.runflow.io/v1/run/google/veo3.1/fast \
  -H "Authorization: Bearer $RUNFLOW_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "prompt": "A professional headshot, soft studio lighting"
  }'
```

### Python

```python
import requests

response = requests.post(
    "https://api.runflow.io/v1/run/google/veo3.1/fast",
    headers={"Authorization": "Bearer RUNFLOW_API_KEY"},
    json={
        "prompt": "A professional headshot, soft studio lighting",
    },
)

data = response.json()
print(data["video"]["url"])
```

### JavaScript

```javascript
const response = await fetch(
  "https://api.runflow.io/v1/run/google/veo3.1/fast",
  {
    method: "POST",
    headers: {
      "Authorization": "Bearer RUNFLOW_API_KEY",
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
      prompt: "A professional headshot, soft studio lighting",
    }),
  }
);

const data = await response.json();
console.log(data.video.url);
```

## Additional Resources

- [Playground](https://www.runflow.io/models/google/veo3.1/fast)
- [API Reference](https://www.runflow.io/models/google/veo3.1/fast/api)
- [Documentation](https://www.runflow.io/docs)