Kling Kling 1.6 Pro API | Pricing & Docs

kling/kling-1-6/pro/image-to-video

1. Get started

Use RunComfy's API to run kling/kling-1-6/pro/image-to-video. For accepted inputs and outputs, see the model's schema.

curl --request POST \
  --url https://model-api.runcomfy.net/v1/models/kling/kling-1-6/pro/image-to-video \
  --header "Content-Type: application/json" \
  --header "Authorization: Bearer <token>" \
  --data '{
    "image_url": ""
  }'

2. Authentication

Set the YOUR_API_TOKEN environment variable with your API key (manage keys in your Profile) and include it on every request as a Bearer token via the Authorization header: Authorization: Bearer $YOUR_API_TOKEN.

3. API reference

Submit a request

Submit an asynchronous generation job and immediately receive a request_id plus URLs to check status, fetch results, and cancel.

curl --request POST \
  --url https://model-api.runcomfy.net/v1/models/kling/kling-1-6/pro/image-to-video \
  --header "Content-Type: application/json" \
  --header "Authorization: Bearer <token>" \
  --data '{
    "image_url": ""
  }'

Monitor request status

Fetch the current state for a request_id ("in_queue", "in_progress", "completed", or "cancelled").

curl --request GET \
  --url https://model-api.runcomfy.net/v1/requests/{request_id}/status \
  --header "Authorization: Bearer <token>"

Retrieve request results

Retrieve the final outputs and metadata for the given request_id; if the job is not complete, the response returns the current state so you can continue polling.

curl --request GET \
  --url https://model-api.runcomfy.net/v1/requests/{request_id}/result \
  --header "Authorization: Bearer <token>"

Cancel a request

Cancel a queued job by request_id, in-progress jobs cannot be cancelled.

curl --request POST \
  --url https://model-api.runcomfy.net/v1/requests/{request_id}/cancel \
  --header "Authorization: Bearer <token>"

4. File inputs

Hosted file (URL)

Provide a publicly reachable HTTPS URL. Ensure the host allows server‑side fetches (no login/cookies required) and isn't rate‑limited or blocking bots. Recommended limits: images ≤ 50 MB (~4K), videos ≤ 100 MB (~2–5 min @ 720p). Prefer stable or pre‑signed URLs for private assets.

5. Schema

Input schema

{
  "type": "object",
  "title": "Input",
  "required": [
    "image_url"
  ],
  "properties": {
    "prompt": {
      "title": "Prompt",
      "description": "",
      "type": "string",
      "maxLength": 1391
    },
    "image_url": {
      "title": "Start Image",
      "description": "The uploaded image must be over 300px with an aspect ratio between 2:5 and 5:2.",
      "type": "string",
      "validations": [
        {
          "validation_rule": "width_pixels>",
          "validation_value": 300,
          "validation_error": "The uploaded image width and height must both exceed 300 pixels."
        },
        {
          "validation_rule": "height_pixels>",
          "validation_value": 300,
          "validation_error": "The uploaded image width and height must both exceed 300 pixels."
        },
        {
          "validation_rule": "file_size_mb<",
          "validation_value": 10,
          "validation_error": "File size must be less than 10 MB."
        }
      ]
    },
    "tail_image_url": {
      "title": "End Image",
      "description": "",
      "type": "string",
      "validations": [
        {
          "validation_rule": "width_pixels>",
          "validation_value": 300,
          "validation_error": "The uploaded image width and height must both exceed 300 pixels."
        },
        {
          "validation_rule": "height_pixels>",
          "validation_value": 300,
          "validation_error": "The uploaded image width and height must both exceed 300 pixels."
        }
      ]
    },
    "duration": {
      "title": "Duration",
      "description": "",
      "type": "integer",
      "enum": [
        5,
        10
      ],
      "default": 5
    },
    "negative_prompt": {
      "title": "Negative Prompt",
      "description": "",
      "type": "string"
    },
    "cfg_scale": {
      "title": "Prompt Strength",
      "description": "High strength ensures prompt accuracy but reduces diversity.",
      "maximum": 1,
      "minimum": 0,
      "type": "number",
      "default": 0.5
    }
  }
}

Output schema

{
  "output": {
    "type": "object",
    "properties": {
      "image": {
        "type": "string",
        "format": "uri",
        "description": "single image URL"
      },
      "video": {
        "type": "string",
        "format": "uri",
        "description": "single video URL"
      },
      "images": {
        "type": "array",
        "description": "multiple image URLs",
        "items": { "type": "string", "format": "uri" }
      },
      "videos": {
        "type": "array",
        "description": "multiple video URLs",
        "items": { "type": "string", "format": "uri" }
      }
    }
  }
}

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