> ## Documentation Index
> Fetch the complete documentation index at: https://docs.hoox.video/llms.txt
> Use this file to discover all available pages before exploring further.

# Kling 2.6 Pro

> Kling · `kling-pro` · video

## Identifier

Use the model identifier `kling-pro` in the `model` field when calling [`/asset/start`](/api-reference/assets/start).

## Capabilities

| Property            | Value                                  |
| ------------------- | -------------------------------------- |
| Reference inputs    | 0–2                                    |
| Input types         | `image` + `image`                      |
| Aspect ratios       | `16:9`, `9:16`, `1:1` (default `9:16`) |
| Durations (seconds) | `5`, `10` (default `5`)                |
| Audio               | yes                                    |
| Max prompt length   | 2500 chars                             |

## Inputs

This model takes **named media inputs**. Pass each one as a top-level field in the request body (not inside `references`). Each field accepts exactly one of `url`, `asset_id`, or `avatar_id`.

| Field         | Type  | Required | Description                                                                                                                                                                     |
| ------------- | ----- | -------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `start_image` | image | no       | First frame of the video. Omit for pure text-to-video.                                                                                                                          |
| `end_image`   | image | no       | Last frame of the video. Requires start\_image — generates a transition from the start frame to this one. Audio generation is disabled automatically when an end frame is used. |

* `url` — a direct, publicly accessible file URL
* `asset_id` — the ID of an existing asset in your Hoox space (e.g. a previous generation)
* `avatar_id` — the ID of an avatar defined in your Hoox space

## Custom settings

These keys go inside the `model_settings` object of the request body.

| Key             | Type    | Default | Affects cost |
| --------------- | ------- | ------- | ------------ |
| `generateAudio` | boolean | `true`  | yes          |

## Pricing

Default parameters (5s): **\~7.5 credits / generation**.

For exact pricing with your own parameters, call [`/asset/pricing`](/api-reference/assets/pricing) with the `model` and any parameters that affect cost.

## Example request

```json theme={null}
{
  "type": "video",
  "model": "kling-pro",
  "prompt": "Describe what you want to generate",
  "start_image": {
    "url": "https://example.com/reference.jpg"
  },
  "end_image": {
    "url": "https://example.com/reference.jpg"
  },
  "aspect_ratio": "9:16",
  "duration": 5
}
```

See [`/asset/start`](/api-reference/assets/start) for the full request/response reference, error codes, and code samples in cURL / Python / JavaScript.