Generate high-quality AI videos using Kling v2.1 with flexible generation modes.

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Models

ModelModeFeatures
kuaishou/kling-2.1std, proImage-to-video only, end image supported
kuaishou/kling-2.1-masterpro onlyText-to-video + image-to-video, no end image

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Kling v2.1

Image-to-video only — start_image_url is required.

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Parameters

ParameterTypeRequiredDefaultDescription
promptstringNo-Text description (optional for i2v)
start_image_urlstringYes-Starting image URL
end_image_urlstringNo-End frame URL
durationintegerNo55 or 10 seconds
modestringNo"std""std" or "pro"
audiobooleanNofalseGenerate audio for the output video

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Example

curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "kuaishou/kling-2.1",
    "input": {
      "prompt": "A butterfly landing on a flower in slow motion",
      "start_image_url": "https://example.com/butterfly.jpg",
      "duration": 5,
      "mode": "pro"
    }
  }'

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Kling v2.1 Master

Supports both text-to-video and image-to-video. Pro-only mode. No end image support.

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Parameters

ParameterTypeRequiredDefaultDescription
promptstringYes*-*Required for text-to-video, optional for image-to-video
start_image_urlstringNo-Starting image URL (enables image-to-video)
durationintegerNo55 or 10 seconds
aspect_ratiostringNo"16:9""16:9", "9:16", "1:1". Text-to-video only
modestringNo"pro"Pro only
audiobooleanNofalseGenerate audio for the output video

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Example - Text-to-Video

curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "kuaishou/kling-2.1-master",
    "input": {
      "prompt": "Cinematic scene with dramatic lighting",
      "aspect_ratio": "16:9",
      "duration": 10
    }
  }'

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Example - Image-to-Video

curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "kuaishou/kling-2.1-master",
    "input": {
      "prompt": "Cinematic scene with dramatic lighting",
      "start_image_url": "https://example.com/start.jpg",
      "duration": 10
    }
  }'

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Response

{
  "code": 200,
  "success": true,
  "data": {
    "task_id": "abc123def456",
    "status": "pending"
  }
}

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Pricing

ModelPrice
v2.1 std (720p)$0.035/s
v2.1 pro (1080p)$0.060/s
v2.1 Master (1080p)$0.085/s