# Ltx 2.5 Text to Video Fast API

> ᡤᡝᠨᡝᡥᡝ ᡩᠠᠮᡠ ᡦᠠᡳᡩᠠᡵᠠᠰᡳ ᠪᡳᠯᠮᡠ，ᠰᠣᠨᡳᠶᠣᠨ ᠰᡳ ᡩᡠᠯᡝᠮᡝ᠂ᡤᡝᠮᡠ ᡶᡳᠯᡝᠮᡝ 2160p ᡩᡝᡵᡳ

5000 ᠣᠨᠴᠣ ᡳ `prompt` ᡳ ᡶᡳᠯᠮᡠ ᠪᡠᠶᡝᠮᠪᡳ。`duration` 6 ᡩᡝᡵᡳ 20 ᠰᡝᡴᡠᠨᡩᡝ ᠠᠮᠠᠰᡳ auto，`resolution` 720p ᡩᡝᡵᡳ 2160p，`aspect_ratio` 16:9 ᠠᠮᠠᠰᡳ 9:16，`fps` 24、25、48 ᠠᠮᠠᠰᡳ 50。ᡝᡵᡝᠨ ᠪᡳᠯᠮᡠ ᡳ ᡥᠠᠨ ᡤᡝᠮᡠ ᠵᡠᠯᡝᠮᡝ ᠣᠴᡳᠨᠠᠮᠪᡳ。`camera_motion` ᠰᡳ `generate_audio` ᠰᡠᠯᡥᠠᠨᠠᠮᠪᡳ。

- Model id: `lightricks/ltx-2.5/text-to-video/fast`
- Made by: Lightricks
- Category: Text to Video
- Output: video
- Price: from $0.09 / second (6 s ≈ $0.54) (cheapest run $0.54 (540 API credits))
- Run: `POST https://api.doitong.ru/v1/run/lightricks/ltx-2.5/text-to-video/fast`
- Quote: `POST https://api.doitong.ru/v1/quote/lightricks/ltx-2.5/text-to-video/fast`
- Docs page: https://doitong.com/mnc/developers/models/lightricks/ltx-2.5/text-to-video/fast

## Pricing

Price: **from $0.09 / second (6 s ≈ $0.54)** (the lowest tier; the quote prices your exact input). Billed per second of output (`duration`, default 6).

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

- When `resolution` = 1080p: $0.13 (130 API credits) / second
- When `resolution` = 1440p: $0.19 (190 API credits) / second
- When `resolution` = 2160p: $0.30 (300 API credits) / second

The full example input below costs $0.78 = 780 API credits (6 s × 130 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/lightricks/ltx-2.5/text-to-video/fast` 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

| Parameter | Canonical name | Type | Required | Default | Allowed values / range | Description |
|---|---|---|---|---|---|---|
| `prompt` |  | string | yes |  | 1 – 5000 characters | ᠰᡠᠨᡤᠠ ᠪᡠᠶᡝᠮᡝ ᡳ ᡥᡡᠯᠠᠨ᠉ |
| `duration` |  | enum | no | `auto` | `6`, `8`, `10`, `12`, `14`, `16`, `18`, `20`, `auto` | ᠪᡠᠶᡝᠮᡝ ᠰᡠᠨᡤᠠ ᡳ ᠵᠠᠯᠠᠨ ᠰᡝᡴᡠᠨᡩ ᡩᡝ᠉ 'auto' ᠣᠴᡳ ᠮᠣᠳᡝᠯ ᠵᠠᠯᠠᠨ ᠪᡝ ᠰᠣᠩᡤᠣᠮᠪᡳ᠉ 720p ᠠᠮᠠᠯᡤᠠ 1080p ᠪᡠᠶᡝᠮᡝ ᡩᡝ 24 ᠠᠮᠠᠯᡤᠠ 25 FPS ᠣᠴᡳ 20 ᠰᡝᡴᡠᠨᡩ, 48 ᠠᠮᠠᠯᡤᠠ 50 FPS ᠣᠴᡳ 10 ᠰᡝᡴᡠᠨᡩ᠉ 1440p ᠠᠮᠠᠯᡤᠠ 2160p ᠣᠴᡳ ᡶᡳᠯᡝᠮᡝ ᡳ ᠵᠠᠯᠠᠨ ᠵᠠᡴᠠ 10 ᠰᡝᡴᡠᠨᡩ᠉ |
| `resolution` |  | enum (string) | no | `1080p` | `720p`, `1080p`, `1440p`, `2160p` | ᠪᡠᠶᡝᠮᡝ ᠰᡠᠨᡤᠠ ᡳ ᠵᠠᠯᠠᠨ᠉ |
| `aspect_ratio` |  | enum (string) | no | `16:9` | `16:9`, `9:16` | ᠪᡠᠶᡝᠮᡝᠨᡳ ᠰᡠᠨᡤᠠᠨᡳ ᠪᡠᡵᡤᡠ. |
| `fps` |  | enum (integer) | no | `25` | `24`, `25`, `48`, `50` | ᠪᡠᠶᡝᠮᡝ ᠰᡠᠨᡤᠠ ᡳ ᡶᡳᠯᡝᠮᡝ ᡳ ᠵᠠᠯᠠᠨ, ᡶᡳᠯᡝᠮᡝ ᠰᡝᡴᡠᠨᡩ ᡩᡝ ᠰᠣᠯᡤᠣᠮᠪᡳ᠉ |
| `generate_audio` |  | boolean | no | `true` |  | ᠪᡠᠶᡝᠮᡝ ᠰᡠᠨᡤᠠ ᡳ ᡤᡳᠰᡠᠨ ᠪᡠᠶᡝᠮᡝ ᡳ ᠠᠰᡥᠠᠨᡳ ᠵᠠᠯᠠᠨ᠉ |
| `camera_motion` |  | enum (string) \| null | no |  | `dolly_in`, `dolly_out`, `dolly_left`, `dolly_right`, `jib_up`, `jib_down`, `static`, `focus_shift` | ᠪᠠᠶᠠᠨ ᡳ ᡠᠰᡥᠠᠨ ᡩᡠᠯᡝᡵᡤᡳ ᠵᠠᠪᡠᡥᠠᠨ ᠪᡠᠶᡝᠮᡝ ᠰᡠᠨᡤᠠ ᡩᡝ᠉ |

## Example input

Required parameters only:

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

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/lightricks/ltx-2.5/text-to-video/fast?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/lightricks/ltx-2.5/text-to-video/fast?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/lightricks/ltx-2.5/text-to-video/fast", 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": "lightricks/ltx-2.5/text-to-video/fast",
      "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": "lightricks/ltx-2.5/text-to-video/fast",
  "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": 780,
    "usd": "0.78",
    "charged": 780,
    "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,
      "width": 1024,
      "height": 768,
      "fps": 1.0,
      "duration": 5,
      "num_frames": 1
    }
  },
  "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, width, height, fps, duration, num_frames} | ᠪᡠᠶᡝᠮᡝᠨᡳ ᠰᡠᠨᡤᠠ ᠶᠠᠪᡠᠮᡝ ᡶᡳᠯᡝ. |

## Related models

- [LTX 2.5 Pro Text to Video](https://doitong.com/developers/models/lightricks/ltx-2.5/text-to-video/pro.md) (`lightricks/ltx-2.5/text-to-video/pro`): from $0.12 / second
- [LTX 2.5 Image to Video Fast](https://doitong.com/developers/models/lightricks/ltx-2.5/image-to-video/fast.md) (`lightricks/ltx-2.5/image-to-video/fast`): from $0.09 / second
- [LTX 2.5 Pro Image to Video](https://doitong.com/developers/models/lightricks/ltx-2.5/image-to-video/pro.md) (`lightricks/ltx-2.5/image-to-video/pro`): from $0.12 / second
- [Ltx 2.5 Audio to Video Fast](https://doitong.com/developers/models/lightricks/ltx-2.5/audio-to-video/fast.md) (`lightricks/ltx-2.5/audio-to-video/fast`): $0.13 / second of input audio
- [Ltx 2.5 Audio to Video Pro](https://doitong.com/developers/models/lightricks/ltx-2.5/audio-to-video/pro.md) (`lightricks/ltx-2.5/audio-to-video/pro`): $0.17 / second of input audio
- [FLUX 3 Max Text to Video](https://doitong.com/developers/models/blackforestlabs/flux-3-max/text-to-video.md) (`blackforestlabs/flux-3-max/text-to-video`): from $0.0425 / second of output video
- [Grok Imagine Video 1.5 Text to Video](https://doitong.com/developers/models/xai/grok-imagine-video/v1.5/text-to-video.md) (`xai/grok-imagine-video/v1.5/text-to-video`): from $0.08 / second
- [Kling 3.0 Pro Text to Video](https://doitong.com/developers/models/kling-video/v3/pro/text-to-video.md) (`kling-video/v3/pro/text-to-video`): from $0.112 / second

## Links

- HTML page: https://doitong.com/developers/models/lightricks/ltx-2.5/text-to-video/fast
- 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=lightricks/ltx-2.5/text-to-video/fast
- Errors: https://doitong.com/developers/docs/errors
- Model details as JSON: https://api.doitong.ru/v1/models/lightricks/ltx-2.5/text-to-video/fast