Kling v3 Pro - Text to Video

Kling 3.0 Pro: Top-tier text-to-video with cinematic visuals, fluid motion, and native audio generation, with multi-shot support.

Pricing: $0.112/second. Endpoint: POST /v1/models/kuaishou/kling-video/v3/pro/text-to-video/runs.

Kling 3.0 Pro: Top-tier text-to-video with cinematic visuals, fluid motion, and native audio generation, with multi-shot support.

Overview

• Endpoint: https://api.runflow.io/v1/models/kuaishou/kling-video/v3/pro/text-to-video/runs
• Model ID: kuaishou/kling-video/v3/pro/text-to-video
• Provider: Kuaishou
• License: commercial
• Last Updated: 2026-04-06

Pricing

• Base price: $0.112/second
• Note: Without audio

Kling v3 Pro - Text to Video API

Endpoint: POST /v1/models/kuaishou/kling-video/v3/pro/text-to-video/runs

Run the model

Python

import requests

response = requests.post(
    "https://api.runflow.io/v1/models/kuaishou/kling-video/v3/pro/text-to-video/runs",
    headers={"Authorization": "Bearer RUNFLOW_API_KEY"},
    json={
        "input": {
            "prompt": "Time-lapse of a flower blooming in a sunlit garden, macro lens, smooth motion, warm tones"
        },
        "callback_url": "https://your-server.com/webhook"
    },
)

data = response.json()
print(data)

Node.js

const response = await fetch(
  "https://api.runflow.io/v1/models/kuaishou/kling-video/v3/pro/text-to-video/runs",
  {
    method: "POST",
    headers: {
      "Authorization": "Bearer RUNFLOW_API_KEY",
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
        "input": {
            "prompt": "Time-lapse of a flower blooming in a sunlit garden, macro lens, smooth motion, warm tones"
        },
        "callback_url": "https://your-server.com/webhook"
    }),
  }
);

const data = await response.json();
console.log(data);

cURL

curl -X POST https://api.runflow.io/v1/models/kuaishou/kling-video/v3/pro/text-to-video/runs \
  -H "Authorization: Bearer $RUNFLOW_API_KEY" \
  -H "Content-Type: application/json" \
  --data-binary @- <<'JSON'
{
    "input": {
        "prompt": "Time-lapse of a flower blooming in a sunlit garden, macro lens, smooth motion, warm tones"
    },
    "callback_url": "https://your-server.com/webhook"
}
JSON

Request parameters

Parameter	Type	Required	Description
input	object	required	Model input parameters. See “Input schema” below.
callback_url	string | null	optional	Webhook URL - POSTed when the run reaches a terminal state.
metadata	object | null	optional	Arbitrary key-value pairs attached to the run.

Input schema

Field	Type	Required	Allowed values	Description
prompt	string	optional	Any	Text prompt for video generation. Either prompt or multi_prompt must be provided, but not both.
aspect_ratio	string	optional	16:9, 9:16, 1:1	The aspect ratio of the generated video frame
generate_audio	boolean	optional	Any	Whether to generate native audio for the video. Supports Chinese and English voice output. Other languages are automatically translated to English. For English speech, use lowercase letters; for acronyms or proper nouns, use uppercase.
multi_prompt	json	optional	See nested fields below	List of prompts for multi-shot video generation. If provided, overrides the single prompt and divides the video into multiple shots with specified prompts and durations.
duration	string	optional	3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15	The duration of the generated video in seconds
shot_type	string	optional	customize, intelligent	The type of multi-shot video generation
negative_prompt	string	optional	Any
cfg_scale	float	optional	Any	The CFG (Classifier Free Guidance) scale is a measure of how close you want the model to stick to your prompt.

Output schema

Field	Type	Description
outputs	json	Unified output array - one entry per generated artifact with url/type/width/height/duration/etc.
nsfw_detected	json	true if the provider flagged output as NSFW, false if cleared, null if not checked.
seed	json	Deterministic seed used for generation, or null if the provider doesn’t return one.
timing	json	Provider timing info (inference_ms etc.), or null.

Callback payload

When you provide a callback_url, Runflow POSTs to it once the run reaches a terminal state.

Field	Type	Description
event	string	Event type: “run.completed”, “run.failed”, or “run.cancelled”.
run_id	string	The unique identifier of the run.
status	string	Terminal status: “succeeded”, “failed”, or “cancelled”.
output	object | null	The run output. Null if the run failed or was cancelled.
duration_ms	number | null	Total run duration in milliseconds.
created_at	string | null	ISO 8601 timestamp when the run was created.
completed_at	string | null	ISO 8601 timestamp when the run reached terminal state.
metadata	object | null	The metadata object passed at run creation, if any.

• Retries: 3 attempts with exponential backoff (1s, 2s). Retries on 5xx / network errors only.
• Headers: Runflow-Request-Id is always sent. Runflow-Signature is sent if a signing secret is configured.

Additional Resources

• Playground
• API Reference
• Documentation
• OpenAPI

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Run lifecycle

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