Kling Video O3 API

Complete API reference for Kling Video O3 models by Kuaishou.

Model Variants

This API supports eight model variants:

Quick Comparison

Supported Aspect Ratios

16:9, 9:16, 1:1

Kling Video O3 Text to Video (Std & Pro)

Endpoint

POST /api/v1/video/task

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: 'kling-video-o3-std-text-to-video',
    prompt: 'A drone flying over a mountain range at sunrise',
    duration: 5,
    aspect_ratio: '16:9'
  })
});

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

Kling Video O3 Image to Video (Std & Pro)

Request Parameters

Required

Optional

Example Request

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{
  model_name: 'kling-video-o3-pro-image-to-video',
  image_url: 'https://example.com/image.jpg',
  prompt: 'Camera slowly pulls back revealing the landscape',
  duration: 5,
  image_end_url: 'https://example.com/end-frame.jpg'
}

Kling Video O3 Reference to Video (Std & Pro)

Request Parameters

Required

Optional

@ (AT) Reference Placeholders

The @ (AT) reference feature links reference media to the prompt through numbered <<<...>>> placeholders. Image numbering starts at 1 and follows the order of the images array. Because this model accepts one reference video URL, <<<video_1>>> refers to video_url.

Example Request

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{
  model_name: 'kling-video-o3-std-reference-to-video',
  video_url: 'https://example.com/source.mp4',
  images: ['https://example.com/reference-a.jpg', 'https://example.com/reference-b.jpg'],
  prompt: 'Character walking through a forest',
  duration: 8,
  aspect_ratio: '16:9',
  keep_original_sound: true
}

@ (AT) Reference-to-Video Request Example

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{
  model_name: 'kling-video-o3-std-reference-to-video',
  video_url: 'https://example.com/motion-reference.mp4',
  images: [
    'https://example.com/athlete-reference.jpg',
    'https://example.com/uniform-reference.jpg'
  ],
  prompt: 'Make the athlete from <<<image_1>>> follow the motion in <<<video_1>>> while preserving the uniform details from <<<image_2>>>',
  duration: 8,
  aspect_ratio: '16:9',
  keep_original_sound: true
}

Kling Video O3 Video Edit (Std & Pro)

Request Parameters

Required

Optional

Example Request

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{
  model_name: 'kling-video-o3-pro-video-edit',
  video_url: 'https://example.com/source.mp4',
  duration: 5,
  images: ['https://example.com/ref.jpg'],
  prompt: 'Add falling snow throughout the scene',
  keep_original_sound: true
}

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/{taskId} to check status:

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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": "succeed",
    "task_status_msg": null,
    "task_result": {
      "videos": [
        {
          "url": "https://example.com/generated-video.mp4"
        }
      ]
    }
  }
}

Status Values

• submitted: Task accepted and waiting to be processed
• processing: Video generation in progress
• succeed: Video generation completed
• failed: Video generation failed

Processing Time

• Standard: 2-5 minutes
• Pro: 3-8 minutes

Best Practices

1. Tier Selection: Use Std for iteration, Pro for final output
2. Motion Description: Include specific camera and subject movement details
3. Reference Inputs: Use clear, high-quality reference images or reference videos for better character consistency
4. Video Edit Prompts: Be specific about what to change while preserving the original content