KuaishouSlowUltra

Kling v2.1

Kling v2.1 with 720p/1080p support and frame transition capabilities for smooth, high-quality video generation.

375 credits

per video

720p and 1080p output support

Smooth frame transitions

Image-to-video capability

Adjustable prompt adherence (cfg_scale)

5 or 10 second duration

Use with AI Assistant

Copy usage instructions for Claude, ChatGPT, or other AI

llms.txt

Quick Start

curl -X POST "https://api.core.today/v1/predictions" \
  -H "Content-Type: application/json" \
  -H "X-API-Key: cdt_your_api_key" \
  -d '{
  "model": "kwaivgi/kling-v2.1",
  "input": {
    "prompt": "Sweeping aerial view of cherry blossom trees along a river, petals floating in the wind, golden hour lighting, cinematic drone movement",
    "duration": "10",
    "aspect_ratio": "16:9",
    "cfg_scale": "0.5"
  }
}'

Parameters

Parameter	Type	Required	Default	Description
`prompt`	string	Yes	-	Text description of the video to generate
`image_url`	string	No	-	Starting image URL for image-to-video
`duration`	integer	No	5	Video duration in seconds (5 or 10) 510
`aspect_ratio`	string	No	16:9	Output aspect ratio 16:99:161:1
`cfg_scale`	float	No	0.5	Prompt adherence (0.0-1.0)

How to Provide File Input

There are 3 ways to provide files for the image_url parameter:

Recommended

Direct Upload (Multipart)

Attach files directly to POST /v1/predictions/upload. No separate upload step needed.

curl -X POST "https://api.core.today/v1/predictions/upload" \
  -H "X-API-Key: cdt_your_api_key" \
  -F "model=kwaivgi/kling-v2.1" \
  -F 'input={"prompt":"your prompt here"}' \
  -F "file:image_url=@your_file.png"

Image URL

Pass a publicly accessible URL directly. You can also use file_url from the Storage API.

{
  "model": "kwaivgi/kling-v2.1",
  "input": {
    "prompt": "your prompt here",
    "image_url": "https://example.com/image.jpg"
  }
}

See the File Upload docs for more upload methods including Presigned URLs.

Common Parameters

Common parameters used when calling POST /v1/predictions.

Parameter	Type	Required	Default	Description
`model`	string	Yes	-	Model identifier
`input`	object	Yes	-	Object containing the model-specific parameters from the table above
`output_folder`	string	No	-	Folder path for output files (max 256 chars, '..' not allowed)
`webhook_url`	string	No	-	Webhook URL to call on completion
`is_public`	boolean	No	false	If true, output files are also available via permanent public URLs

Examples

Cinematic Landscape

High-resolution landscape video

curl -X POST "https://api.core.today/v1/predictions" \
  -H "Content-Type: application/json" \
  -H "X-API-Key: cdt_your_api_key" \
  -d '{
  "model": "kwaivgi/kling-v2.1",
  "input": {
    "prompt": "Sweeping aerial view of cherry blossom trees along a river, petals floating in the wind, golden hour lighting, cinematic drone movement",
    "duration": "10",
    "aspect_ratio": "16:9",
    "cfg_scale": "0.5"
  }
}'

Fashion Showcase

Stylish fashion video

curl -X POST "https://api.core.today/v1/predictions" \
  -H "Content-Type: application/json" \
  -H "X-API-Key: cdt_your_api_key" \
  -d '{
  "model": "kwaivgi/kling-v2.1",
  "input": {
    "prompt": "Model walking down a neon-lit urban alley, stylish outfit, confident stride, slow motion, professional fashion photography style",
    "duration": "5",
    "aspect_ratio": "9:16",
    "cfg_scale": "0.7"
  }
}'