> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mixroute.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Gemini Native (Video)

> Google Veo video generation model

## Introduction

Veo is a multimodal video generation model from Google Vertex AI, supporting text-to-video (T2V), first-frame constraint, and first-last frame constraint (3.1 series only) for generating coherent videos. Call through MixRoute unified video interface: first [submit task](/en/api-reference/endpoint/submit-video-task) to get `task_id`, then [query task](/en/api-reference/endpoint/query-video-task) to poll status and retrieve results.

## Authentication

Bearer Token, e.g., `Bearer sk-xxxxxxxxxx`

## Supported Models

| Model ID                        | Description                                                               |
| ------------------------------- | ------------------------------------------------------------------------- |
| `veo-3.0-fast-generate-001`     | Text-to-video, first-frame mode, fast version (audio included by default) |
| `veo-3.1-fast-generate-preview` | Text-to-video, first-frame/first-last frame mode, fast version            |
| `veo-3.0-generate-preview`      | Text-to-video, first-frame mode                                           |
| `veo-3.1-generate-preview`      | Text-to-video, first-frame/first-last frame mode                          |

## Call Flow

1. **Submit Task**: `POST /v1/video/generations`, pass `model`, `prompt` and Veo-specific parameters.
2. **Poll Status**: `GET /v1/video/generations/{task_id}`, until `status` is `succeeded` or `failed`.
3. **Get Result**: When successful, the `url` in the response contains video data (Veo may return `data:video/mp4;base64,...` or OSS link).

## Veo-Specific Parameters

<ParamField body="prompt" type="string" required>
  Video generation prompt describing the scene and actions.
</ParamField>

<ParamField body="durationSeconds" type="integer">
  Video duration (seconds), supported values: `4`, `6`, `8`.
</ParamField>

<ParamField body="aspectRatio" type="string">
  Aspect ratio, only supports: `16:9`, `9:16`.
</ParamField>

<ParamField body="resolution" type="string">
  Resolution: `720p`, `1080p`.
</ParamField>

<ParamField body="image" type="string">
  First frame reference image (URL or Base64), for image-to-video/first-frame constraint.
</ParamField>

<ParamField body="lastFrameImage" type="string">
  Last frame reference image (only `veo-3.1` series supported), works with first frame for first-last frame constraint.
</ParamField>

<ParamField body="generateAudio" type="boolean">
  Whether to generate synchronized audio. Fast version models ignore this parameter and always include audio.
</ParamField>

<ParamField body="sampleCount" type="integer">
  Number of videos to generate per request, range `1-4`.
</ParamField>

For more parameters (such as `personGeneration`, `addWatermark`, `seed`), see [Submit Video Task](/en/api-reference/endpoint/submit-video-task).

## Request Examples

<Tabs>
  <Tab title="Submit Veo Task (Text-to-Video)">
    ```bash theme={null}
    curl -X POST "https://api.mixroute.ai/v1/video/generations" \
      -H "Authorization: Bearer sk-xxxxxxxxxx" \
      -H "Content-Type: application/json" \
      -d '{
        "model": "veo-3.1-fast-generate-preview",
        "prompt": "Morning sunlight on cyber city skyscrapers, camera slowly pushing forward",
        "durationSeconds": 6,
        "aspectRatio": "16:9",
        "resolution": "1080p",
        "generateAudio": false
      }'
    ```
  </Tab>

  <Tab title="Query Task Status">
    ```bash theme={null}
    curl -X GET "https://api.mixroute.ai/v1/video/generations/{task_id}" \
      -H "Authorization: Bearer sk-xxxxxxxxxx"
    ```
  </Tab>
</Tabs>

For complete request/response specifications and multi-model comparison, see [Submit Video Task](/en/api-reference/endpoint/submit-video-task) and [Query Video Task](/en/api-reference/endpoint/query-video-task).

<RequestExample>
  ```bash cURL theme={null}
  curl --request POST \
    --url https://api.mixroute.ai/v1/video/generations \
    --header 'Authorization: Bearer sk-xxxxxxxxxx' \
    --header 'Content-Type: application/json' \
    --data '{
      "model": "veo-3.1-fast-generate-preview",
      "prompt": "Morning sunlight on cyber city skyscrapers, camera slowly pushing forward",
      "durationSeconds": 6,
      "aspectRatio": "16:9",
      "resolution": "1080p",
      "generateAudio": false
    }'
  ```

  ```python Python theme={null}
  import requests

  url = "https://api.mixroute.ai/v1/video/generations"
  headers = {
      "Authorization": "Bearer sk-xxxxxxxxxx",
      "Content-Type": "application/json"
  }
  payload = {
      "model": "veo-3.1-fast-generate-preview",
      "prompt": "Morning sunlight on cyber city skyscrapers, camera slowly pushing forward",
      "durationSeconds": 6,
      "aspectRatio": "16:9",
      "resolution": "1080p",
      "generateAudio": False
  }
  response = requests.post(url, json=payload, headers=headers)
  print(response.json())
  ```

  ```javascript JavaScript theme={null}
  const response = await fetch('https://api.mixroute.ai/v1/video/generations', {
    method: 'POST',
    headers: {
      'Authorization': 'Bearer sk-xxxxxxxxxx',
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({
      model: 'veo-3.1-fast-generate-preview',
      prompt: 'Morning sunlight on cyber city skyscrapers, camera slowly pushing forward',
      durationSeconds: 6,
      aspectRatio: '16:9',
      resolution: '1080p',
      generateAudio: false
    })
  });
  const data = await response.json();
  console.log(data);
  ```

  ```php PHP theme={null}
  <?php
  $client = new GuzzleHttp\Client();
  $response = $client->post('https://api.mixroute.ai/v1/video/generations', [
      'headers' => [
          'Authorization' => 'Bearer sk-xxxxxxxxxx',
          'Content-Type' => 'application/json',
      ],
      'json' => [
          'model' => 'veo-3.1-fast-generate-preview',
          'prompt' => 'Morning sunlight on cyber city skyscrapers, camera slowly pushing forward',
          'durationSeconds' => 6,
          'aspectRatio' => '16:9',
          'resolution' => '1080p',
          'generateAudio' => false
      ]
  ]);
  echo $response->getBody();
  ```

  ```go Go theme={null}
  package main

  import (
      "bytes"
      "encoding/json"
      "net/http"
  )

  func main() {
      payload := map[string]interface{}{
          "model": "veo-3.1-fast-generate-preview",
          "prompt": "Morning sunlight on cyber city skyscrapers, camera slowly pushing forward",
          "durationSeconds": 6,
          "aspectRatio": "16:9",
          "resolution": "1080p",
          "generateAudio": false,
      }
      body, _ := json.Marshal(payload)
      req, _ := http.NewRequest("POST", "https://api.mixroute.ai/v1/video/generations", bytes.NewBuffer(body))
      req.Header.Set("Authorization", "Bearer sk-xxxxxxxxxx")
      req.Header.Set("Content-Type", "application/json")
      http.DefaultClient.Do(req)
  }
  ```

  ```java Java theme={null}
  import java.net.http.*;
  import java.net.URI;

  HttpClient client = HttpClient.newHttpClient();
  String json = """
      {
        "model": "veo-3.1-fast-generate-preview",
        "prompt": "Morning sunlight on cyber city skyscrapers, camera slowly pushing forward",
        "durationSeconds": 6,
        "aspectRatio": "16:9",
        "resolution": "1080p",
        "generateAudio": false
      }
      """;
  HttpRequest request = HttpRequest.newBuilder()
      .uri(URI.create("https://api.mixroute.ai/v1/video/generations"))
      .header("Authorization", "Bearer sk-xxxxxxxxxx")
      .header("Content-Type", "application/json")
      .POST(HttpRequest.BodyPublishers.ofString(json))
      .build();
  HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
  System.out.println(response.body());
  ```

  ```ruby Ruby theme={null}
  require 'net/http'
  require 'json'

  uri = URI('https://api.mixroute.ai/v1/video/generations')
  http = Net::HTTP.new(uri.host, uri.port)
  http.use_ssl = true

  request = Net::HTTP::Post.new(uri)
  request['Authorization'] = 'Bearer sk-xxxxxxxxxx'
  request['Content-Type'] = 'application/json'
  request.body = {
    model: 'veo-3.1-fast-generate-preview',
    prompt: 'Morning sunlight on cyber city skyscrapers, camera slowly pushing forward',
    durationSeconds: 6,
    aspectRatio: '16:9',
    resolution: '1080p',
    generateAudio: false
  }.to_json

  response = http.request(request)
  puts response.body
  ```
</RequestExample>

<ResponseExample>
  ```json Response theme={null}
  {
    "task_id": "task_xxx",
    "status": "pending",
    "created_at": 1709459123
  }
  ```
</ResponseExample>