Video Generation

Kling 4.0 API

Kling Video 4.0. Up to 30 seconds at 1080p with native audio and dialogue: text, start/end frames, reference images and videos, or edit an existing clip. Integrate this model via REST with endpoint docs, parameters, and code examples.

Prompting guide Compare video models Use cases

Img2Vid

Audio

Credit Cost

25 credits

Type

Video

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API Endpoint

POST

/api/v1/models/kling-4-0/run

Test This Model

Run a real request through the API pipeline and inspect the exact input and output your integration will handle. Uses your credits like any API call; failed runs are refunded automatically.

LLM.txt

AI-Ready

For AI assistants

Copy this model's documentation into Claude, GPT, or any AI for instant integration help.

/llm/kling-4-0.txt

OpenAPI Spec

Swagger compatible

Import into Postman, Swagger UI, or generate client SDKs in any language.

/api/openapi

Parameters

Input parameters accepted by this model

Parameter	Type	Description	Default
`prompt` required	string	What happens in the clip. Timed beats, camera moves and quoted dialogue all work. Refer to inputs as <<<image_1>>> (frames first, then reference images) and <<<video_1>>> (source video first, then reference videos).	-
`image`	url	Optional first frame. The image sets the aspect ratio.	-
`last_frame_image`	url	Optional last frame. Requires image.	-
`reference_images`	array	Up to 10 images (frames included) for cast, products, locations or a storyboard. items: string	-
`video`	url	A clip to edit with the prompt (swap a product, add or remove a subject, restyle). Set duration to the clip length; billed at the video-input rate.	-
`reference_videos`	array	Up to 5 clips (30 s total) whose motion, camera path or structure to carry over. Billed at the video-input rate. items: string	-
`resolution`	enum	Output resolution `720p1080p`	`1080p`
`aspect_ratio`	enum	Text-to-video only; inputs set their own shape. `16:99:161:121:9`	`16:9`
`duration`	integer	Clip length in seconds (3-30). With video, the source clip length. min: 3 \| max: 30	`5`

Use saved characters (@Name)

Write @Name in the prompt to use a character, product, outfit, location, prop or style saved in the account's Character Studio, for example "@Mara on a beach at sunset". Its photos are added to reference_images automatically, after any images you send yourself, so your own image numbering is unchanged. List saved names with GET /api/v1/characters and save new ones with POST /api/v1/characters. An @word that names nothing saved stays plain text.

Supported Aspect Ratios

16:9

9:16

1:1

21:9

Code Examples

Text → video — copy and paste to get started

bash

curl -X POST "https://pixeldojo.ai/api/v1/models/kling-4-0/run" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "prompt": "0-4s: slow push in on a barista in a rainy cafe. 4-10s: she looks up and says \"Last order of the night.\" Audio: rain on glass, espresso hiss.",
    "duration": 10,
    "resolution": "1080p"
  }'

Response Format

Submit Response (202 Accepted)

json

{
  "jobId": "job_abc123...",
  "status": "pending",
  "statusUrl": "https://pixeldojo.ai/api/v1/jobs/job_abc123...",
  "creditCost": 25,
  "creditsRemaining": 95,
  "expiresAt": "2026-10-24T21:06:30Z"
}

Completed Response