# H3 Max Turbo Extend Video API

> Prolunghescha in video da funtauna da 1.625 fin a 60 secundas cun 0.71 fin a 15 secundas da novas sequenzas guidadas dal prompt

Continuescha in video da `video_url` (fin a 50 MB) cun novas sequenzas descritgas en `prompt`. `duration` fixescha la lunghezza agiuntada da 0.71 fin a 15 secundas, e la resoluziun va da 480P fin a 2K. `output` returna il video cumplettamain prolunghà u be il clip da cuntinuaziun. Fin a 3 `reference_audio_urls` pon guidar l’audio.

- Model id: `minimax/h3-max-turbo/extend-video`
- Made by: MiniMax
- Category: Video to Video
- Output: video
- Price: from $0.025 / second (5 s ≈ $0.125) (cheapest run $0.125 (125 API credits))
- Run: `POST https://api.doitong.ru/v1/run/minimax/h3-max-turbo/extend-video`
- Quote: `POST https://api.doitong.ru/v1/quote/minimax/h3-max-turbo/extend-video`
- Docs page: https://doitong.com/rm/developers/models/minimax/h3-max-turbo/extend-video

## Pricing

Price: **from $0.025 / second (5 s ≈ $0.125)** (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 `resolution` = 768P: $0.04 (40 API credits) / second
- When `resolution` = 1080P: $0.08 (80 API credits) / second
- When `resolution` = 2K: $0.16 (160 API credits) / second

The full example input below costs $0.20 = 200 API credits (5 s × 40 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/minimax/h3-max-turbo/extend-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 |
|---|---|---|---|---|---|---|
| `video_url` | `video` | string (video URL) | yes |  | ≥ 1 characters | URL dal video funtauna per l'extensiun; la datoteca na dastga betg surpassar 50 MB. Ils videos acceptads han ina proporziun d'aspect da 0.4–2.5 e ina durada da 1.625 s–60 s. |
| `prompt` |  | string | yes |  | 1 – 50000 characters | Descripziun dals eveniments che duain suandar, empè d'ina descripziun dal filmà funtauna. |
| `reference_audio_urls` |  | array of audio URL | no |  | ≤ 3 items | Clips opziunals che dirigian il nov audio da la cuntinuaziun enstagl da la colonna sonora funtauna; inditgar lur rollas en il prompt, per exempel 'Audio 1 for the voice' e 'Audio 2 for background music'. Mintgin sto durar 2–15 secundas, cun maximalmain 15 secundas en tut ils clips. Il video extendì cumplett mantegna la colonna sonora funtauna originala, da la quala la fin dirigia anc la transiziun. |
| `enable_prompt_expansion` |  | boolean | no | `true` |  | Perfecziunament dal prompt dirigì da la funtauna per ina cuntinuaziun pli consistenta. L'activaziun permetta al sistem da reveder automaticamain il prompt, ma po prolungar l'elavuraziun. |
| `duration` |  | number | no | `5` | 0.71 – 15 | Quantitad dumandada da nov filmà, mesirada en secundas empè da la lunghezza cumpletta dal clip da cuntinuaziun. Quel clip surpiglia er las ultimas 1.625 secundas da la funtauna; l'arrundament da las frame po agiuntar ulteriur temp. |
| `resolution` |  | enum (string) | no | `768P` | `480P`, `768P`, `1080P`, `2K` | Resoluziun dal video resultant. |
| `aspect_ratio` |  | enum (string) | no | `auto` | `auto`, `21:9`, `16:9`, `4:3`, `1:1`, `3:4`, `9:16` | Proporziuns da l'output: tscherner ina proporziun applitgescha in tagl per s'adattar ad ella, entant che 'auto' utilisescha la proporziun d'aspect dal video funtauna. |
| `seed` |  | integer \| null | no |  |  | Seed da la generaziun da la cuntinuaziun; sche na vegn betg specificà, vegn utilisada ina valur casuala. |
| `output` |  | enum (string) | no | `extended` | `extended`, `continuation` | Modus d'output: 'continuation' furnescha il nov filmà precedì d'ina repetiziun da 1.625 secundas da la fin da la funtauna. Per retschaiver la funtauna colliada cun il nov filmà en in sulet video, tscherner 'extended'. |
| `enable_safety_checker` |  | boolean | no | `true` |  | Moderaziun tant dal video d'input sco dal prompt. |

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

A fuller example:

```json
{
  "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
  "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/minimax/h3-max-turbo/extend-video?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
    "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/minimax/h3-max-turbo/extend-video?wait=20", {
  method: "POST",
  headers,
  body: JSON.stringify({
    "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
    "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 = {
    "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
    "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/minimax/h3-max-turbo/extend-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": "minimax/h3-max-turbo/extend-video",
      "input": {
        "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
        "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": "minimax/h3-max-turbo/extend-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": 200,
    "usd": "0.20",
    "charged": 200,
    "refunded": 0
  },
  "input": {
    "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
    "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
    },
    "seed": 42,
    "duration": 5,
    "source": {},
    "expanded_prompt": "string",
    "timings": {}
  },
  "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 resultant, cun ina repetiziun iniziala da 1.625 secundas en il modus 'continuation'. |
| `seed` | integer | Seed applitgà durant la generaziun da la cuntinuaziun. |
| `duration` | number | Durada dal video restituì en secundas. |
| `source` | object | Metadatas dal filmà funtauna che cuvran las dimensiuns (ladezza e autezza), la frequenza da frame, la lunghezza e l'audio. |
| `expanded_prompt` | string \| null | Text dal prompt amplifitgà, u null, sch'igl è vegnì fatg naginas midadas. |
| `timings` | object |  |

## Related models

- [H3 Max Turbo Text to Video](https://doitong.com/developers/models/minimax/h3-max-turbo/text-to-video.md) (`minimax/h3-max-turbo/text-to-video`): from $0.0163 / second of output video
- [H3 Max Turbo Image to Video](https://doitong.com/developers/models/minimax/h3-max-turbo/image-to-video.md) (`minimax/h3-max-turbo/image-to-video`): from $0.0163 / second of output video
- [H3 Max](https://doitong.com/developers/models/minimax/h3-max/insert-video.md) (`minimax/h3-max/insert-video`): from $0.05 / second
- [H3 Max Extend Video](https://doitong.com/developers/models/minimax/h3-max/extend-video.md) (`minimax/h3-max/extend-video`): from $0.05 / second of output video
- [H3 Max Recast](https://doitong.com/developers/models/minimax/h3-max/recast.md) (`minimax/h3-max/recast`): from $0.30 / second of input video
- [H3 Max Reframe](https://doitong.com/developers/models/minimax/h3-max/reframe-video.md) (`minimax/h3-max/reframe-video`): from $0.05 / second of input video
- [H3 Max Relight](https://doitong.com/developers/models/minimax/h3-max/relight.md) (`minimax/h3-max/relight`): from $0.05 / second of input video
- [AMT Interpolation](https://doitong.com/developers/models/amt-interpolation.md) (`amt-interpolation`): $0.000575 / second of processing time

## Links

- HTML page: https://doitong.com/developers/models/minimax/h3-max-turbo/extend-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=minimax/h3-max-turbo/extend-video
- Errors: https://doitong.com/developers/docs/errors
- Model details as JSON: https://api.doitong.ru/v1/models/minimax/h3-max-turbo/extend-video