FLUX 3 API

Complete API reference for FLUX 3 video generation models. All variants use the unified video task endpoint.

Model Variants

Quick Comparison

All four models support these aspect ratios:

21:9, 2:1, 16:9, 4:3, 1:1, 3:4, 9:16

Endpoint

POST /api/v1/video/task

Authentication

Authorization: Bearer YOUR_API_KEY

FLUX 3 Text to Video

Request Parameters

Required

Optional

Example Request

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const response = await fetch('https://api.flaq.ai/api/v1/video/task', {
  method: 'POST',
  headers: {
    Authorization: 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    model_name: 'flux-3.0-text-to-video',
    prompt: 'A cinematic aerial shot of a coastal city at sunrise',
    resolution: '1080p',
    aspect_ratio: '16:9',
    duration: 10,
    sound: true,
  }),
});

const { data } = await response.json();
const taskId = data.task_id;

FLUX 3 Image to Video

Request Parameters

Required

Optional

Example Request

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const response = await fetch('https://api.flaq.ai/api/v1/video/task', {
  method: 'POST',
  headers: {
    Authorization: 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    model_name: 'flux-3.0-image-to-video',
    prompt: 'A gentle camera push forward with natural subject motion',
    resolution: '1080p',
    aspect_ratio: '16:9',
    image_url: 'https://example.com/first-frame.jpg',
    duration: 10,
    sound: true,
  }),
});

const { data } = await response.json();
const taskId = data.task_id;

FLUX 3 Start-End to Video

Request Parameters

Required

Optional

Example Request

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const response = await fetch('https://api.flaq.ai/api/v1/video/task', {
  method: 'POST',
  headers: {
    Authorization: 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    model_name: 'flux-3.0-start-end-to-video',
    prompt: 'Create a smooth cinematic transition with consistent lighting',
    resolution: '720p',
    aspect_ratio: '16:9',
    image_url: 'https://example.com/start-frame.jpg',
    image_end_url: 'https://example.com/end-frame.jpg',
    duration: 8,
    sound: true,
  }),
});

const { data } = await response.json();
const taskId = data.task_id;

FLUX 3 Video Extend

The input video must use MP4 format, be no longer than 15 seconds, and be no larger than 50 MB.

Request Parameters

Required

Optional

Example Request

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const response = await fetch('https://api.flaq.ai/api/v1/video/task', {
  method: 'POST',
  headers: {
    Authorization: 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    model_name: 'flux-3.0-video-extend',
    prompt: 'Continue the scene as the subject walks toward the skyline',
    resolution: '1080p',
    aspect_ratio: '16:9',
    video_url: 'https://example.com/source-video.mp4',
    duration: 10,
    sound: true,
  }),
});

const { data } = await response.json();
const taskId = data.task_id;

Response Format

Initial Response

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{
  "code": 0,
  "message": "success",
  "data": {
    "task_id": "{task_id}",
    "response_url": "https://api.flaq.ai/api/v1/video/{task_id}",
    "task_status": "submitted"
  }
}

Polling Response

Poll GET /api/v1/video/{task_id} to check the task status:

jsonCopy
{
  "code": 0,
  "message": "success",
  "data": {
    "task_id": "{task_id}",
    "response_url": "https://api.flaq.ai/api/v1/video/{task_id}",
    "task_status": "succeed",
    "task_status_msg": null,
    "task_result": {
      "videos": [
        {
          "url": "https://example.com/generated-video.mp4"
        }
      ]
    }
  }
}

Status Values

• submitted: Task accepted
• processing: Video generation in progress
• succeed: Video generation completed successfully
• failed: Video generation failed

Best Practices

1. Aspect Ratio: Choose the ratio for the target channel before submitting the task.
2. Duration: Use a value from 5 to 20 seconds for every variant.
3. Input Media: Use accessible image URLs and an MP4 source within the video extension limits.
4. Polling: Poll every 5–10 seconds until task_status is succeed or failed.