Kling v3.0 4K — Image to Video


Model ID	`kuaishou/kling-v3-4k-i2v`
Family	`kling-v3-novita`
Task	`image-to-video`
Modality	Video
Upstream	Kuaishou Kling 3.0 (4K)

sound: true switches the per-second billing rate from $0.399/s** (no audio) to **$ 0.599/s (with audio). The default is false.

Endpoint

POST https://routerbase.com/v1/videos/generations

Async — returns {id, status: "pending"}; poll GET /v1/videos/generations/{id} until success or failed.

Parameters

string

required

Text prompt describing motion / scene changes. Max 2500 characters.

string[]

required

Exactly one source-image URL (HTTPS, PNG / JPEG).

string

Optional public HTTPS URL pinning the final frame of the output.

integer

default:"5"

Length of the generated clip in seconds. Range [3, 15]. Drives billing.

boolean

default:"false"

Whether to synthesize an audio track. Flips the per-second rate from

0.399/s to

0.599/s.

number

default:"0.5"

Classifier-free guidance strength. Range [0, 1].

string

Content to steer the model away from. Max 2500 characters.

Example

curl https://routerbase.com/v1/videos/generations \
  -H "Authorization: Bearer $ROUTERBASE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "kuaishou/kling-v3-4k-i2v",
    "prompt": "the subject turns toward the camera and smiles",
    "image_urls": ["https://example.com/portrait.jpg"],
    "duration": 5,
    "sound": true
  }'

{ "id": "kling_002…", "status": "pending", "model": "kuaishou/kling-v3-4k-i2v" }

Poll until terminal:

curl https://routerbase.com/v1/videos/generations/kling_002… \
  -H "Authorization: Bearer $ROUTERBASE_API_KEY"

{
  "id": "kling_002…",
  "status": "success",
  "data": [{ "url": "https://…mp4" }]
}

Get Started

API Reference

Kling v3.0 4K — Image to Video

Endpoint

Parameters

Example

Reference

​Endpoint

​Parameters

​Example

​Reference

Endpoint

Parameters

Example

Reference