# Veo 3.1

> Transform static images into dynamic, high-quality videos with synchronized audio and precise creative control.


## Overview

- **Endpoint**: `https://api.segmind.com/v1/veo-3.1`
- **Model ID**: `veo-3.1`
- **Category**: Image-to-Video Generation
- **Type**: Synchronous (Direct response)

- **Average Cost**: $2.256969696969697


## Pricing

| generate_audio | duration | cost |
| --- | --- | --- |
| false | 4 | 0.8 |
| true | 4 | 1.6 |
| false | 6 | 1.2 |
| true | 6 | 2.4 |
| false | 8 | 1.6 |
| true | 8 | 3.2 |

## API Information

This model uses a **synchronous response pattern**:
1. Make a POST request with your parameters
2. Receive the output directly in the response (binary for images/videos/audio, JSON for text)
3. No polling required - response is immediate


### Input Schema

The API accepts the following input parameters:

- **`seed`** (`integer`, _optional_):
  Seed
  Sets a random seed for consistency. Useful for repeated generations.

- **`image`** (`File (URL)`, _optional_):
  Image
  Start generation from this image. Ideal for specific starting visuals.

- **`prompt`** (`string`, _required_):
  Prompt
  Describe the video content. Use clear, concise language for best results.
  - Default: `"A woman is giving a keynote presentation at a tech conference, wearing a sleek white blazer with the Veo 3.1 logo subtly embroidered, highlighted by ambient blue stage lighting. She is on a modern conference stage with geometric patterns and LED screens behind her, discussing how Veo 3.1 can integrate reference images to enhance AI-generated video content. The Veo 3.1 logo is also displayed prominently on a large digital screen behind her"`

- **`duration`** (`integer`, _optional_):
  Duration
  Choose the video length: short is 4s, medium 6s, long 8s.
  - Default: `8`
  - Options: "4" (4), "6" (6), "8" (8)

- **`last_frame`** (`File (URL)`, _optional_):
  Last frame
  End video with this image. Useful for specific concluding visuals.

- **`resolution`** (`string`, _optional_):
  Resolution
  Set video quality: 720p for standard, 1080p for high resolution.
  - Default: `"1080p"`
  - Options: "720p" (720p), "1080p" (1080p)

- **`aspect_ratio`** (`string`, _optional_):
  Aspect ratio
  Choose aspect ratio: 16:9 for landscape, 9:16 for portrait mode.
  - Default: `"16:9"`
  - Options: "16:9" (16:9), "9:16" (9:16)

- **`generate_audio`** (`boolean`, _optional_):
  Generate audio
  Enable audio generation. Recommended for videos requiring sound.
  - Default: `true`

- **`negative_prompt`** (`string`, _optional_):
  Negative prompt
  Exclude elements from video. Useful for refining details.
  - Default: `"no black and white, no sharp angles"`

- **`reference_images`** (`array`, _optional_):
  Input image list
  Use reference images for consistency. Essential for maintaining subject style.
  - Item type: string


**Required Parameters Example**:

```json
{
  "prompt": "A woman is giving a keynote presentation at a tech conference, wearing a sleek white blazer with the Veo 3.1 logo subtly embroidered, highlighted by ambient blue stage lighting. She is on a modern conference stage with geometric patterns and LED screens behind her, discussing how Veo 3.1 can integrate reference images to enhance AI-generated video content. The Veo 3.1 logo is also displayed prominently on a large digital screen behind her"
}
```


**Full Example**:

```json
{
  "seed": null,
  "image": null,
  "prompt": "A woman is giving a keynote presentation at a tech conference, wearing a sleek white blazer with the Veo 3.1 logo subtly embroidered, highlighted by ambient blue stage lighting. She is on a modern conference stage with geometric patterns and LED screens behind her, discussing how Veo 3.1 can integrate reference images to enhance AI-generated video content. The Veo 3.1 logo is also displayed prominently on a large digital screen behind her",
  "duration": 8,
  "last_frame": null,
  "resolution": "1080p",
  "aspect_ratio": "16:9",
  "generate_audio": true,
  "negative_prompt": "no black and white, no sharp angles",
  "reference_images": []
}
```


### Output Schema

The API returns a synchronous response based on the model type:

**For Image/Video/Audio Models**:
- Response contains binary data (image/png, video/mp4, audio/mp3)
- Content-Type header indicates the media type
- Save the response body directly to a file

**For Text Models**:
- Response is JSON with the generated text
- Structure varies by model

**HTTP Response Codes**:
- **200 - OK**: Request successful, output in response body
- **400 - Bad Request**: Invalid parameters
- **401 - Unauthorized**: Invalid or missing API key
- **404 - Not Found**: Model not found
- **406 - Not Acceptable**: Insufficient credits
- **429 - Too Many Requests**: Rate limit exceeded
- **500 - Server Error**: Internal server error


## Usage Examples

### cURL

```bash
curl -X POST "https://api.segmind.com/v1/veo-3.1" \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "seed": null,
  "image": null,
  "prompt": "A woman is giving a keynote presentation at a tech conference, wearing a sleek white blazer with the Veo 3.1 logo subtly embroidered, highlighted by ambient blue stage lighting. She is on a modern conference stage with geometric patterns and LED screens behind her, discussing how Veo 3.1 can integrate reference images to enhance AI-generated video content. The Veo 3.1 logo is also displayed prominently on a large digital screen behind her",
  "duration": 8,
  "last_frame": null,
  "resolution": "1080p",
  "aspect_ratio": "16:9",
  "generate_audio": true,
  "negative_prompt": "no black and white, no sharp angles",
  "reference_images": []
}'
```

### Python

```python
import requests
import json

api_key = "YOUR_API_KEY"
url = "https://api.segmind.com/v1/veo-3.1"

data = {
  "seed": null,
  "image": null,
  "prompt": "A woman is giving a keynote presentation at a tech conference, wearing a sleek white blazer with the Veo 3.1 logo subtly embroidered, highlighted by ambient blue stage lighting. She is on a modern conference stage with geometric patterns and LED screens behind her, discussing how Veo 3.1 can integrate reference images to enhance AI-generated video content. The Veo 3.1 logo is also displayed prominently on a large digital screen behind her",
  "duration": 8,
  "last_frame": null,
  "resolution": "1080p",
  "aspect_ratio": "16:9",
  "generate_audio": true,
  "negative_prompt": "no black and white, no sharp angles",
  "reference_images": []
}

response = requests.post(
    url,
    json=data,
    headers={
        'x-api-key': api_key,
        'Content-Type': 'application/json'
    }
)

if response.status_code == 200:
    # For image/video/audio models, response.content contains the binary data
    with open('output.png', 'wb') as f:
        f.write(response.content)
    print('Generation complete, saved to output.png')
else:
    print(f"Error: {response.status_code}")
    print(response.text)
```

### JavaScript

```javascript
const apiKey = 'YOUR_API_KEY';
const url = 'https://api.segmind.com/v1/veo-3.1';

const data = {
  "seed": null,
  "image": null,
  "prompt": "A woman is giving a keynote presentation at a tech conference, wearing a sleek white blazer with the Veo 3.1 logo subtly embroidered, highlighted by ambient blue stage lighting. She is on a modern conference stage with geometric patterns and LED screens behind her, discussing how Veo 3.1 can integrate reference images to enhance AI-generated video content. The Veo 3.1 logo is also displayed prominently on a large digital screen behind her",
  "duration": 8,
  "last_frame": null,
  "resolution": "1080p",
  "aspect_ratio": "16:9",
  "generate_audio": true,
  "negative_prompt": "no black and white, no sharp angles",
  "reference_images": []
};

const response = await fetch(url, {
  method: 'POST',
  headers: {
    'x-api-key': apiKey,
    'Content-Type': 'application/json',
  },
  body: JSON.stringify(data),
});

if (response.ok) {
  // For image/video/audio models, response contains binary data
  const blob = await response.blob();
  const downloadUrl = URL.createObjectURL(blob);

  // Create download link
  const a = document.createElement('a');
  a.href = downloadUrl;
  a.download = 'output.png';
  a.click();

  console.log('Generation complete');
}
```


## Additional Resources

### Documentation

- [Model Playground](https://www.segmind.com/models/veo-3.1)
- [API Documentation](https://www.segmind.com/models/veo-3.1/api)
- [Pricing Details](https://www.segmind.com/models/veo-3.1/pricing)
- [Platform Documentation](https://docs.segmind.com/)

### Tags

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