# Kling O3 Reference to Video [Pro] API

> Pro reference-to-video na nagpapanatiling pare-pareho ang mga character at object gamit ang mga larawan at element

Gumagawa ng mga eksena sa video mula sa reference `image_urls` na tinutukoy bilang @Image1 at iba pa, kasama ang `elements` para sa mga character o object. Opsyonal na itinatakda ng `start_image_url` at `end_image_url` ang una at huling frame. Ang duration ay 3 hanggang 15 segundo, ang aspect ratio ay 16:9, 9:16 o 1:1. Sinusuportahan ang `multi_prompt` shots at optional na audio.

- Model id: `kling-video/o3/pro/reference-to-video`
- Made by: Kling
- Category: Reference to Video
- Output: video
- Price: from $0.112 / second (5 s ≈ $0.56) (cheapest run $0.56 (560 API credits))
- Run: `POST https://api.doitong.ru/v1/run/kling-video/o3/pro/reference-to-video`
- Quote: `POST https://api.doitong.ru/v1/quote/kling-video/o3/pro/reference-to-video`
- Docs page: https://doitong.com/fil/developers/models/kling-video/o3/pro/reference-to-video

## Pricing

Price: **from $0.112 / second (5 s ≈ $0.56)** (the lowest tier; the quote prices your exact input). Billed per second of output (`duration`, default 15).

Price rules (the first rule that matches the input wins; a parameter you leave out counts as its default):

- When `generate_audio` = true: $0.14 (140 API credits) / second

The full example input below costs $0.56 = 560 API credits (5 s × 112 API credits).

Prices are the upstream price in USD, paid from the API balance in API credits (1000 API credits = 1 USD). `POST https://api.doitong.ru/v1/quote/kling-video/o3/pro/reference-to-video` with the same JSON body returns the exact price for that input; the quote is exactly what a run charges. Invalid input is never charged and failed or canceled requests are refunded automatically.

## Input parameters

Send either the canonical name or the native field name (not both). Canonical names are the same across models.

| Parameter | Canonical name | Type | Required | Default | Allowed values / range | Description |
|---|---|---|---|---|---|---|
| `enable_safety_checker` |  | boolean | no | `true` |  | Maaaring i-disable ang safety checks lamang kapag awtorisado ang account; ang mga kahilingang walang awtorisasyon ay palaging sasailalim sa checking. |
| `prompt` |  | string \| null | no |  | ≤ 2500 characters | Mga text instruction para bumuo ng video. Eksaktong isa sa prompt o multi_prompt ang dapat ibigay. |
| `multi_prompt` |  | array of object {prompt, duration} \| null | no |  |  | Listahan ng mga prompt para bumuo ng video na may maraming shot. |
| `multi_prompt[].prompt` |  | string | yes |  |  | Mga text instruction para sa kasalukuyang shot. |
| `multi_prompt[].duration` |  | enum (string) | no | `5` | `1`, `2`, `3`, `4`, `5`, `6`, `7`, `8`, `9`, `10`, `11`, `12`, `13`, `14`, `15` | Haba ng kasalukuyang shot, sinusukat sa segundo. |
| `start_image_url` | `image` | string (image URL) \| null | no |  |  | Larawang ginagamit para sa opening frame ng video. Hindi dapat lumampas sa 50 MB ang laki ng file; dapat hindi bababa sa 300px ang lapad at taas, at nasa pagitan ng 0.40 at 2.50 ang aspect ratio. |
| `end_image_url` | `end_image` | string (image URL) \| null | no |  |  | Larawang nagsusuplay ng final frame ng video, na limitado sa 50 MB. Dapat hindi bababa sa 300 px ang lapad at taas, at nasa pagitan ng 0.40 at 2.50 ang aspect ratio. |
| `image_urls` | `images` | array of image URL \| null | no |  |  | Mga larawang gumagabay sa style o appearance, na tinutukoy sa prompt gamit ang @Image1, @Image2, at iba pa. Kapag may video input, hindi maaaring lumampas sa 4 entries ang pinagsamang elements at reference larawan. Limitado sa 50 MB ang bawat file, na may hindi bababa sa 300 px na lapad at taas at aspect ratio na 0.40 hanggang 2.50. |
| `elements` |  | array of object {frontal_image_url, reference_image_urls, video_url, voice_id} \| null | no |  |  | Mga character o object na isasama, na tinutukoy sa prompt gamit ang @Element1 at @Element2. |
| `elements[].frontal_image_url` |  | string (image URL) \| null | no |  |  | Frontal na larawang nagpapakita ng pangunahing view ng element. Hindi dapat lumampas sa 50 MB ang file; dapat hindi bababa sa 300px ang lapad at taas, at nasa pagitan ng 0.40 at 2.50 ang aspect ratio. |
| `elements[].reference_image_urls` |  | array of image URL \| null | no |  |  | Magbigay ng 1–3 karagdagang reference na larawan na nagpapakita ng iba't ibang anggulo. Dapat nasa pagitan ng 0.40 at 2.50 ang aspect ratio ng bawat larawan, hindi bababa sa 300px ang parehong dimension, at hindi lalampas sa 50.0MB. |
| `elements[].video_url` |  | string (video URL) \| null | no |  |  | URL na tumutukoy sa video ng isang element; isang element lamang bawat kahilingan ang maaaring may video. Dapat hanggang 200 MB lamang ang file, na may lapad at taas na nasa pagitan ng 720px at 2160px. Dapat nasa pagitan ng 3 segundo at 10.05 segundo ang tagal, at 24.0 hanggang 60.0 ang FPS. |
| `elements[].voice_id` |  | string \| null | no |  |  | Voice ID na itinalaga sa element. Gagamitin ang itinalagang voice kapag tinutukoy ang element na iyon. |
| `generate_audio` |  | boolean | no | `false` |  | Kinokontrol kung bubuo ng native audio kasabay ng video. |
| `duration` |  | enum (string) | no | `5` | `3`, `4`, `5`, `6`, `7`, `8`, `9`, `10`, `11`, `12`, `13`, `14`, `15` | Haba ng video, mula 3 hanggang 15 segundo. |
| `shot_type` |  | enum (string) | no | `customize` | `customize`, `intelligent` | Piliin kung paano pinaplano ng multi-shot pagbuo ang mga shot; kapag pinili ang 'intelligent', ipinauubaya sa modelo ang structure ng shot. |
| `aspect_ratio` |  | enum (string) | no | `16:9` | `16:9`, `9:16`, `1:1` | Ratio ng lapad sa taas ng mga frame sa nabuong video. |

File parameters (`image`, `end_image`, `images`) take a public `https://` URL, a `data:` URI up to 10 MB, or the `file_url` of an upload from `POST /files`.

## Example input

Required parameters only:

```json
{}
```

A fuller example:

```json
{
  "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field"
}
```

## Run it

Set `DOITONG_API_KEY` to a key from https://doitong.com/developers/dashboard#keys. `?wait=20` returns the finished request in the same call when it is ready within 20 seconds; otherwise poll `GET /requests/{id}` (it also accepts `?wait=`), or pass `webhook_url`.

### curl

```bash
# Run the model; wait up to 20 s for the finished result in the same call
curl -X POST "https://api.doitong.ru/v1/run/kling-video/o3/pro/reference-to-video?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field"
  }'

# Still "queued" or "running"? Poll with the id from the response:
curl "https://api.doitong.ru/v1/requests/REQUEST_ID?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY"
```

### JavaScript

```javascript
const API = "https://api.doitong.ru/v1";
const headers = {
  "Authorization": "Bearer " + process.env.DOITONG_API_KEY,
  "Content-Type": "application/json",
};

// Run the model; wait up to 20 s for the finished result in the same call
let res = await fetch(API + "/run/kling-video/o3/pro/reference-to-video?wait=20", {
  method: "POST",
  headers,
  body: JSON.stringify({
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field"
  }),
});
let request = await res.json();
if (!res.ok) throw new Error(request.error.code + ": " + request.error.message);

// Not finished yet: long-poll until it is
while (request.status === "queued" || request.status === "running") {
  res = await fetch(API + "/requests/" + request.id + "?wait=20", { headers });
  request = await res.json();
}
if (request.status !== "succeeded") throw new Error(JSON.stringify(request.error));
console.log(request.outputs.map((o) => o.url), request.cost.credits + " API credits ($" + request.cost.usd + ")");
```

### Python

```python
import os
import requests

API = "https://api.doitong.ru/v1"
headers = {"Authorization": "Bearer " + os.environ["DOITONG_API_KEY"]}

payload = {
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
}

# Run the model; wait up to 20 s for the finished result in the same call
r = requests.post(API + "/run/kling-video/o3/pro/reference-to-video", params={"wait": 20}, json=payload, headers=headers)
request = r.json()
if not r.ok:
    raise RuntimeError(request["error"]["code"] + ": " + request["error"]["message"])

# Not finished yet: long-poll until it is
while request["status"] in ("queued", "running"):
    request = requests.get(API + "/requests/" + request["id"], params={"wait": 20}, headers=headers).json()
if request["status"] != "succeeded":
    raise RuntimeError(request["error"])
print([o["url"] for o in request["outputs"]], request["cost"]["credits"], "API credits", "$" + request["cost"]["usd"])
```

### MCP

The MCP server at `https://api.doitong.ru/v1/mcp` exposes the tools `search_models`, `get_model`, `quote`, `run`, `get_request`, `cancel_request`, `list_requests`, `create_upload` and `get_account`. A `run` call for this model:

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "run",
    "arguments": {
      "model_id": "kling-video/o3/pro/reference-to-video",
      "input": {
        "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field"
      },
      "wait_seconds": 20
    }
  }
}
```

## Response

Every call returns a request object. `status` is one of `queued`, `running`, `succeeded`, `failed`, `canceled`. `outputs` lists the generated files with URLs on our storage (kept forever, or 7 days with `?storage=temporary`; `storage` says which); `output` is the model's own result object with the same URLs.

```json
{
  "id": "req_8k2m4q7x1z9c3v5b6n0p2r4t",
  "object": "request",
  "model": "kling-video/o3/pro/reference-to-video",
  "status": "succeeded",
  "created_at": "2026-10-20T12:00:00Z",
  "started_at": "2026-10-20T12:00:02Z",
  "completed_at": "2026-10-20T12:00:09Z",
  "queue_position": null,
  "cost": {
    "credits": 560,
    "usd": "0.56",
    "charged": 560,
    "refunded": 0
  },
  "input": {
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field"
  },
  "output": {
    "video": {
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.mp4",
      "content_type": "video/mp4",
      "file_name": "0-output.mp4",
      "file_size": 1843200
    }
  },
  "outputs": [
    {
      "type": "video",
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.mp4",
      "content_type": "video/mp4",
      "file_size": 1843200,
      "width": 1280,
      "height": 720,
      "duration": 5,
      "stored": true
    }
  ],
  "error": null,
  "metrics": {
    "inference_seconds": 6.8
  },
  "urls": {
    "self": "https://api.doitong.ru/v1/requests/req_8k2m4q7x1z9c3v5b6n0p2r4t",
    "cancel": "https://api.doitong.ru/v1/requests/req_8k2m4q7x1z9c3v5b6n0p2r4t/cancel"
  }
}
```

### Output fields (`output`)

| Field | Type | Description |
|---|---|---|
| `video` | object {url, content_type, file_name, file_size} | Videong ginawa ng modelo. |

## Related models

- [Kling O3 Text to Video \[Pro\]](https://doitong.com/developers/models/kling-video/o3/pro/text-to-video.md) (`kling-video/o3/pro/text-to-video`): from $0.112 / second
- [Kling O3 Text to Video \[Standard\]](https://doitong.com/developers/models/kling-video/o3/standard/text-to-video.md) (`kling-video/o3/standard/text-to-video`): from $0.084 / second
- [Kling Video · O3 · 4k · Text to Video](https://doitong.com/developers/models/kling-video/o3/4k/text-to-video.md) (`kling-video/o3/4k/text-to-video`): $0.42 / second
- [Kling O3 Image to Video · Pro](https://doitong.com/developers/models/kling-video/o3/pro/image-to-video.md) (`kling-video/o3/pro/image-to-video`): from $0.112 / second
- [Kling O3 Image to Video · Standard](https://doitong.com/developers/models/kling-video/o3/standard/image-to-video.md) (`kling-video/o3/standard/image-to-video`): from $0.084 / second
- [Kling Video · O3 · 4k · Image to Video](https://doitong.com/developers/models/kling-video/o3/4k/image-to-video.md) (`kling-video/o3/4k/image-to-video`): $0.42 / second
- [Kling O3 Reference to Video \[Standard\]](https://doitong.com/developers/models/kling-video/o3/standard/reference-to-video.md) (`kling-video/o3/standard/reference-to-video`): from $0.084 / second
- [Kling Video · O3 · 4k · Reference to Video](https://doitong.com/developers/models/kling-video/o3/4k/reference-to-video.md) (`kling-video/o3/4k/reference-to-video`): $0.42 / second

## Links

- HTML page: https://doitong.com/developers/models/kling-video/o3/pro/reference-to-video
- All models and guides for AI agents: https://doitong.com/developers/llms.txt
- OpenAPI 3.1 with this model's typed request body: https://doitong.com/developers/openapi.json?model=kling-video/o3/pro/reference-to-video
- Errors: https://doitong.com/developers/docs/errors
- Model details as JSON: https://api.doitong.ru/v1/models/kling-video/o3/pro/reference-to-video