KuaishouvideoNew

Kling 4.0 Text to Video API

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

Text 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/text-to-video

FromUp to −5%

$0.149/s$0.157

per second of video · 720p

Operational99.92% uptime (30 days)median 6m 44s

Create with Kling 4.0 Get API key

API docs →Compare models →

Try Kling 4.0 Text to Video

Prompt*

0/8000

Aspect ratio

Output frame shape.

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 Image to Video · Kling 4.0 Reference to Video

See the Kling 4.0 examples and prompts

Kling 4.0 Text to Video API

POST/api/v1/run/kuaishou/kling-4.0/text-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
`aspect_ratio`	string (enum)	Output frame shape. Values: 16:9 · 9:16 · 1:1 · 21:9 Default: 16:9	Yes
`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/text-to-video`, {
  method: "POST",
  headers,
  body: JSON.stringify({
    "prompt": "A paper boat drifts along a rain-filled gutter at night, neon reflections, the soft patter of rain",
    "aspect_ratio": "16:9",
    "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/text-to-video", headers=headers, json={
    "prompt": "A paper boat drifts along a rain-filled gutter at night, neon reflections, the soft patter of rain",
    "aspect_ratio": "16:9",
    "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/text-to-video \
  -H "Authorization: Bearer $CHEAPERGEN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "prompt": "A paper boat drifts along a rain-filled gutter at night, neon reflections, the soft patter of rain",
  "aspect_ratio": "16:9",
  "resolution": "720p",
  "duration": 5
}'

Response

{
  "id": "gen_8c2QmX1nq0k4",
  "object": "generation",
  "model": "kuaishou/kling-4.0",
  "endpoint": "kuaishou/kling-4.0/text-to-video",
  "mode": "text-to-video",
  "status": "queued",
  "input": {
    "prompt": "A paper boat drifts along a rain-filled gutter at night, neon reflections, the soft patter of rain",
    "aspect_ratio": "16:9",
    "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/text-to-video",
  "mode": "text-to-video",
  "status": "succeeded",
  "input": {
    "prompt": "A paper boat drifts along a rain-filled gutter at night, neon reflections, the soft patter of rain",
    "aspect_ratio": "16:9",
    "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.