KuaishouvideoNew

Kling 4.0 Image to Video API

Name: Kling 4.0 API
Brand: Kuaishou
SKU: kuaishou/kling-4.0
Availability: InStock

Image to Video with Kling 4.0 by Kuaishou. Kling's newest video model — up to 30 s with stereo sound on every clip.

kuaishou/kling-4.0/image-to-video

FromUp to −5%

$0.149/s$0.157

per second of video · 720p

Operational99.94% uptime (30 days)median 15m 16s

Create with Kling 4.0 Get API key

API docs →Compare models →

Try Kling 4.0 Image to Video

Prompt*

0/8000

First frame*

Image used as the opening frame. JPG/PNG/WebP, URL or upload.

Last frame

Optional closing frame — the model animates between the two.

Aspect ratio

Matches first frame

Not used here: the video keeps the first frame's aspect ratio.

Resolution

Output resolution. Higher resolutions cost more per second.

Duration

Length of the generated clip in seconds (3–30s). You pay per second.

Estimated cost…

Create a free account with Google or email — pay only for what you generate.

Your video will appear here

Write a prompt, pick your settings and hit Run. You only pay for successful generations.

Also available: Kling 4.0 Text to Video · Kling 4.0 Reference to Video

See the Kling 4.0 examples and prompts

Kling 4.0 Image to Video API

POST/api/v1/run/kuaishou/kling-4.0/image-to-video

Submits an asynchronous job and returns 202 with a generation id. Poll GET /api/v1/generations/{id} or pass webhook_url. See job lifecycle.

Input parameters

Name	Type	Description	Affects price
`prompt`required	string	Describe the shot: subject, action, camera movement, lighting and style.	No
`image_url`required	string (URL)	Image used as the opening frame. JPG/PNG/WebP, URL or upload.	No
`end_image_url`	string (URL)	Optional closing frame — the model animates between the two.	No
`resolution`	string (enum)	Output resolution. Higher resolutions cost more per second. Values: 720p · 1080p Default: 720p	Yes
`duration`	integer	Length of the generated clip in seconds (3–30s). You pay per second. Range: 3–30s Default: 5	Yes
`webhook_url`	string (URL)	Optional. We POST the finished generation here, signed with your webhook secret. Webhooks	No

Request

const API = "https://cheapergen.com/api/v1";
const headers = {
  Authorization: `Bearer ${process.env.CHEAPERGEN_API_KEY}`,
  "Content-Type": "application/json",
};

// 1. Submit the job
let job = await fetch(`${API}/run/kuaishou/kling-4.0/image-to-video`, {
  method: "POST",
  headers,
  body: JSON.stringify({
    "prompt": "She turns toward the window and smiles as the curtains sway; slow push-in",
    "image_url": "https://cdn.cheapergen.com/samples/portrait.jpg",
    "resolution": "720p",
    "duration": 5
  }),
}).then((r) => r.json());

// 2. Poll until it finishes (or pass webhook_url and skip polling)
while (job.status === "queued" || job.status === "running") {
  await new Promise((r) => setTimeout(r, 3000));
  job = await fetch(`${API}/generations/${job.id}`, { headers }).then((r) => r.json());
}

console.log(job.status === "succeeded" ? job.output.video.url : job.error);

import os, time, requests

API = "https://cheapergen.com/api/v1"
headers = {"Authorization": f"Bearer {os.environ['CHEAPERGEN_API_KEY']}"}

# 1. Submit the job
job = requests.post(f"{API}/run/kuaishou/kling-4.0/image-to-video", headers=headers, json={
    "prompt": "She turns toward the window and smiles as the curtains sway; slow push-in",
    "image_url": "https://cdn.cheapergen.com/samples/portrait.jpg",
    "resolution": "720p",
    "duration": 5
}).json()

# 2. Poll until it finishes (or pass "webhook_url" and skip polling)
while job["status"] in ("queued", "running"):
    time.sleep(3)
    job = requests.get(f"{API}/generations/{job['id']}", headers=headers).json()

print(job["status"], job["output"]["video"]["url"] if job["status"] == "succeeded" else job["error"])

curl -X POST https://cheapergen.com/api/v1/run/kuaishou/kling-4.0/image-to-video \
  -H "Authorization: Bearer $CHEAPERGEN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "prompt": "She turns toward the window and smiles as the curtains sway; slow push-in",
  "image_url": "https://cdn.cheapergen.com/samples/portrait.jpg",
  "resolution": "720p",
  "duration": 5
}'

Response

{
  "id": "gen_8c2QmX1nq0k4",
  "object": "generation",
  "model": "kuaishou/kling-4.0",
  "endpoint": "kuaishou/kling-4.0/image-to-video",
  "mode": "image-to-video",
  "status": "queued",
  "input": {
    "prompt": "She turns toward the window and smiles as the curtains sway; slow push-in",
    "image_url": "https://cdn.cheapergen.com/samples/portrait.jpg",
    "resolution": "720p",
    "duration": 5
  },
  "output": null,
  "error": null,
  "cost": {
    "amount_usd": 0.2255,
    "currency": "usd",
    "estimated": true,
    "official_usd": null,
    "list_price_source": "official",
    "list_price_label": "Official",
    "saved_usd": null
  },
  "source": "api",
  "started_at": null,
  "completed_at": null,
  "urls": {
    "get": "https://cheapergen.com/api/v1/generations/gen_8c2QmX1nq0k4",
    "cancel": "https://cheapergen.com/api/v1/generations/gen_8c2QmX1nq0k4/cancel"
  },
  "created_at": "2026-10-15T09:21:04Z"
}

{
  "id": "gen_8c2QmX1nq0k4",
  "object": "generation",
  "model": "kuaishou/kling-4.0",
  "endpoint": "kuaishou/kling-4.0/image-to-video",
  "mode": "image-to-video",
  "status": "succeeded",
  "input": {
    "prompt": "She turns toward the window and smiles as the curtains sway; slow push-in",
    "image_url": "https://cdn.cheapergen.com/samples/portrait.jpg",
    "resolution": "720p",
    "duration": 5
  },
  "output": {
    "video": {
      "url": "https://cdn.cheapergen.com/outputs/gen_8c2Q.mp4",
      "content_type": "video/mp4"
    }
  },
  "error": null,
  "cost": {
    "amount_usd": 0.2255,
    "currency": "usd",
    "estimated": false,
    "official_usd": 0.264,
    "list_price_source": "official",
    "list_price_label": "Official",
    "saved_usd": 0.0385
  },
  "source": "api",
  "created_at": "2026-10-15T09:21:04Z",
  "started_at": "2026-10-15T09:21:06Z",
  "completed_at": "2026-10-15T09:22:31Z"
}

Kling 4.0 pricing

Pay per second of video as you go, with no subscription required (monthly plans are optional). Failed generations are refunded automatically.

Tier	Official price	CheaperGen	You save
720p audio included	~~$0.157~~/s	$0.1486/s	−5%
1080p audio included	~~$0.235~~/s	$0.2226/s	−5%

Official price: Kling developer API list price for Kling 4.0, kling.ai/dev/pricing (1 unit = $0.157 / s at 720p, 1.5 units = $0.235 / s at 1080p; with input video $0.094 / $0.141 per second of output plus the longer of the output and the input video; audio always on). Prices verified October 18, 2026.
Audio is always generated and included in the price.
With a reference video, the output seconds plus the longer of the output and the reference videos are billed at a lower per-second rate.