Kling v3.0 4K — Text to Video


Model ID	`kuaishou/kling-v3-4k-t2v`
Family	`kling-v3-novita`
Task	`text-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 the desired video. Max 2500 characters.

integer

default:"5"

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

"16:9" | "9:16" | "1:1"

default:"\"16:9\""

Aspect ratio of the generated video.

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]. Higher values follow the prompt more literally.

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-t2v",
    "prompt": "a calm beach at sunrise, gentle waves",
    "duration": 5,
    "aspect_ratio": "16:9",
    "sound": false
  }'

{ "id": "kling_001…", "status": "pending", "model": "kuaishou/kling-v3-4k-t2v" }

Poll until terminal:

curl https://routerbase.com/v1/videos/generations/kling_001… \
  -H "Authorization: Bearer $ROUTERBASE_API_KEY"

{
  "id": "kling_001…",
  "status": "success",
  "data": [{ "url": "https://…mp4" }]
}

Get Started

API Reference

Kling v3.0 4K — Text to Video

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