# Kling O3 Reference to Video [Pro] API

> Reference-to-video Pro yang menjaga konsistensi karakter dan objek menggunakan gambar dan elemen

Membangun adegan video dari `image_urls` referensi yang disebut sebagai @Image1 dan seterusnya, serta `elements` untuk karakter atau objek. `start_image_url` dan `end_image_url` opsional menetapkan bingkai pertama dan terakhir. Durasi 3 hingga 15 detik, dengan rasio aspek 16:9, 9:16, atau 1:1. Mendukung shot `multi_prompt` dan audio opsional.

- 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/id/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` |  | Pemeriksaan keamanan hanya dapat dinonaktifkan dengan otorisasi akun; permintaan tanpa otorisasi selalu menjalani pemeriksaan. |
| `prompt` |  | string \| null | no |  | ≤ 2500 characters | Instruksi teks yang digunakan untuk membuat video. Sediakan tepat satu dari prompt atau multi_prompt. |
| `multi_prompt` |  | array of object {prompt, duration} \| null | no |  |  | Daftar prompt yang digunakan untuk membuat video dengan beberapa shot. |
| `multi_prompt[].prompt` |  | string | yes |  |  | Instruksi teks untuk shot saat ini. |
| `multi_prompt[].duration` |  | enum (string) | no | `5` | `1`, `2`, `3`, `4`, `5`, `6`, `7`, `8`, `9`, `10`, `11`, `12`, `13`, `14`, `15` | Durasi shot saat ini, diukur dalam detik. |
| `start_image_url` | `image` | string (image URL) \| null | no |  |  | Gambar yang digunakan untuk bingkai pembuka video. Ukuran file tidak boleh melebihi 50 MB; lebar dan tinggi masing-masing harus minimal 300px, dengan rasio aspek antara 0.40 dan 2.50. |
| `end_image_url` | `end_image` | string (image URL) \| null | no |  |  | Gambar yang menyediakan bingkai akhir video, dibatasi hingga 50 MB. Lebar dan tinggi masing-masing harus minimal 300 px, dengan rasio aspek dari 0.40 hingga 2.50. |
| `image_urls` | `images` | array of image URL \| null | no |  |  | Gambar yang memandu gaya atau tampilan, dirujuk dalam prompt menggunakan @Image1, @Image2, dan seterusnya. Dengan input video, elemen dan gambar referensi secara keseluruhan tidak boleh melebihi 4 entri. Setiap file dibatasi hingga 50 MB, dengan lebar dan tinggi masing-masing minimal 300 px serta rasio aspek dari 0.40 hingga 2.50. |
| `elements` |  | array of object {frontal_image_url, reference_image_urls, video_url, voice_id} \| null | no |  |  | Karakter atau objek yang akan disertakan, dirujuk dalam prompt menggunakan @Element1 dan @Element2. |
| `elements[].frontal_image_url` |  | string (image URL) \| null | no |  |  | Gambar tampak depan yang menunjukkan tampilan utama elemen. Ukuran file tidak boleh melebihi 50 MB; lebar dan tinggi masing-masing harus minimal 300px, dengan rasio aspek antara 0.40 dan 2.50. |
| `elements[].reference_image_urls` |  | array of image URL \| null | no |  |  | Sediakan 1–3 gambar referensi tambahan yang menampilkan sudut berbeda. Setiap gambar harus memiliki rasio aspek antara 0.40 dan 2.50, berukuran minimal 300px pada kedua dimensi, dan tidak lebih besar dari 50.0MB. |
| `elements[].video_url` |  | string (video URL) \| null | no |  |  | URL yang mengarah ke video elemen; hanya satu elemen per permintaan yang boleh menyertakan video. File maksimal 200 MB, dengan lebar dan tinggi masing-masing antara 720px dan 2160px. Durasi harus antara 3 detik dan 10.05 detik, dan FPS antara 24.0 dan 60.0. |
| `elements[].voice_id` |  | string \| null | no |  |  | Voice ID yang ditetapkan ke elemen. Referensi ke elemen tersebut menggunakan suara yang ditetapkan. |
| `generate_audio` |  | boolean | no | `false` |  | Mengontrol apakah audio asli dibuat bersamaan dengan video. |
| `duration` |  | enum (string) | no | `5` | `3`, `4`, `5`, `6`, `7`, `8`, `9`, `10`, `11`, `12`, `13`, `14`, `15` | Durasi video, berkisar dari 3 hingga 15 detik. |
| `shot_type` |  | enum (string) | no | `customize` | `customize`, `intelligent` | Pilih cara pembuatan multi-shot merencanakan shot; memilih 'intelligent' mendelegasikan struktur shot kepada model. |
| `aspect_ratio` |  | enum (string) | no | `16:9` | `16:9`, `9:16`, `1:1` | Rasio lebar terhadap tinggi untuk bingkai dalam video yang dibuat. |

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} | Video yang dihasilkan model. |

## 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