# Kling O3 Reference Video to Video [Pro] API

> Pro־ראַנגיקער O3 מאָדעל וואָס שאַפֿט נײַע שאָסן לויט דער באַוועגונג און קאַמעראַ־סטיל פֿון אַ רעפֿערענץ־ווידעא

נעמט אַ רעפֿערענץ־ווידעא (`video_url`, .mp4/.mov, 3-15 s, 720-3840px, מאַקסימום 200MB) און אַ פּינטלעך, און שאַפֿט אַ נײַעם קליפּ לויט דער רעפֿערענץ. דער רעזולטאַט־`duration` קען זײַן 3 ביז 15 סעקונדעס און `aspect_ratio` איז auto, 16:9, 9:16 אָדער 1:1. מעגן צוגעקומען ווערן רעפֿערענץ־בילדער און `elements`, ביז 4 צוזאַמען; `keep_audio` קאָנטראָלירט דעם אָריגינעלן קלאַנג.

- Model id: `kling-video/o3/pro/video-to-video/reference`
- Made by: Kling
- Category: Video to Video
- Output: video
- Price: $0.168 / second (3 s ≈ $0.504) (cheapest run $0.504 (504 API credits))
- Run: `POST https://api.doitong.ru/v1/run/kling-video/o3/pro/video-to-video/reference`
- Quote: `POST https://api.doitong.ru/v1/quote/kling-video/o3/pro/video-to-video/reference`
- Docs page: https://doitong.com/yi/developers/models/kling-video/o3/pro/video-to-video/reference

## Pricing

Price: **$0.168 / second (3 s ≈ $0.504)**. Billed per second of output (`duration`, default 15).

The full example input below costs $2.52 = 2520 API credits (15 s × 168 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/video-to-video/reference` 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` |  | זיכערהייט־קאָנטראָלן קענען ווערן אויסגעשלאָסן נאָר מיט אַקאַונט־דערלויבעניש; בקשות אָן דערלויבעניש ווערן שטענדיק קאָנטראָלירט. |
| `prompt` |  | string | yes |  | ≤ 2500 characters | טעקסט־אנווײַזונגען פֿאַר גענערירן דעם ווידעא. נוצן @Video1 צו באַצייכענען דעם רעפֿערענץ־ווידעא. |
| `video_url` | `video` | string (video URL) | yes |  |  | URL וואָס ווײַזט צו אַ רעפֿערענץ־ווידעא אין .mp4 אָדער .mov פֿאָרמאַט, נישט גרעסער ווי 200MB. ביידע דימענסיעס מוזן זײַן צווישן 720px און 3840px, מיט אַ ראַם־קורס פֿון 23.0–60.0 FPS און אַ לענג פֿון 3–15 סעקונדעס (מאַקסימום 15.05 סעקונדעס). |
| `image_urls` | `images` | array of image URL \| null | no |  |  | בילדער וואָס פירן דעם סטיל אָדער אויסזען, אָנגעוויזן אינעם פּראָמפּט מיט @Image1, @Image2 און ווײַטער. מיט ווידעא־אַרײַנגעבונג טאָרן עלעמענטן און רעפֿערענץ־בילדער צוזאַמען נישט איבערגיין 4 איינטראָגן. יעדער פֿײַל איז באַגרענעצט צו 50 MB, מיט ברייט און הייך פֿון לכל־הפּחות 300 px און אַן אַספּעקט־פֿאַרהעלטעניש פֿון 0.40 ביז 2.50. |
| `keep_audio` |  | boolean | no | `true` |  | קאָנטראָלירט אָפּהיטונג פֿונעם רעפֿערענץ־ווידעאָס אָריגינעלן אַודיאָ. |
| `elements` |  | array of object {frontal_image_url, reference_image_urls} \| null | no |  |  | כאַראַקטערן אָדער אָביעקטן צו אַרײַננעמען, אָנגעוויזן אינעם פּראָמפּט מיט @Element1 און @Element2. |
| `elements[].frontal_image_url` |  | string (image URL) \| null | no |  |  | פֿראָנטאַלער בילד וואָס ווײַזט דעם עלעמענטס הויפּט־אויסזען. פֿײַלגרייס טאָר נישט איבערגיין 50 MB; ברייט און הייך מוזן יעדער זײַן לכל־הפּחות 300px, מיט אַן אַספּעקט־פֿאַרהעלטעניש צווישן 0.40 און 2.50. |
| `elements[].reference_image_urls` |  | array of image URL \| null | no |  |  | צושטעלן 1–3 נאָך־רעפֿערענץ־בילדער וואָס ווײַזן פֿאַרשידענע ווינקלען. יעדער בילד מוז האָבן אַן אַספּעקט־פֿאַרהעלטעניש צווישן 0.40 און 2.50, זײַן לכל־הפּחות 300px אין ביידע דימענסיעס און נישט גרעסער ווי 50.0MB. |
| `shot_type` |  | string | no | `customize` |  | מאָדע גענוצט צו גענערירן ווידעאָס מיט עטלעכע שאָסן. |
| `aspect_ratio` |  | enum (string) | no | `auto` | `auto`, `16:9`, `9:16`, `1:1` | פֿאַרהעלטעניש פֿון ברייט צו הייך. |
| `duration` |  | enum (string) \| null | no |  | `3`, `4`, `5`, `6`, `7`, `8`, `9`, `10`, `11`, `12`, `13`, `14`, `15` | ווידעא־לענג, געמאסטן אין סעקונדעס; דער רעפֿערענץ־ווידעאָ־ראַנג איז 3–15s. |

File parameters (`video`, `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
{
  "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
  "video": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4"
}
```

A fuller example:

```json
{
  "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
  "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4"
}
```

## 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/video-to-video/reference?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",
    "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4"
  }'

# 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/video-to-video/reference?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",
    "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4"
  }),
});
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",
    "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
}

# 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/video-to-video/reference", 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/video-to-video/reference",
      "input": {
        "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
        "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4"
      },
      "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/video-to-video/reference",
  "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": 2520,
    "usd": "2.52",
    "charged": 2520,
    "refunded": 0
  },
  "input": {
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
    "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4"
  },
  "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} | ווידעא געשאַפֿן דורכן מאָדעל. |

## 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 \[Pro\]](https://doitong.com/developers/models/kling-video/o3/pro/reference-to-video.md) (`kling-video/o3/pro/reference-to-video`): from $0.112 / 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

## Links

- HTML page: https://doitong.com/developers/models/kling-video/o3/pro/video-to-video/reference
- 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/video-to-video/reference
- Errors: https://doitong.com/developers/docs/errors
- Model details as JSON: https://api.doitong.ru/v1/models/kling-video/o3/pro/video-to-video/reference