# LTX 2.5 Fast API

> Lightricks's LTX 2.5 Fast: text to video, image to video and first and last frames, up to 4K. By Lightricks, on Revana from $0.12 per second of video.

- Model id: `ltx-2.5-fast`
- Kind: video
- Maker: Lightricks
- Tasks: Text to video, Image to video, First + last frame
- Resolutions: 720p, 1080p, 2K, 4K
- Durations: 6 s, 8 s, 10 s
- Audio: silent only
- Routes: 1
- Status: live on the API
- Page: https://revana.si/models/ltx-2.5-fast

## Price (per second of video, USD)

| Resolution | Price | Credits |
|---|---|---|
| 720p | $0.12 | 12 |
| 1080p | $0.18 | 18 |
| 2K | $0.26 | 26 |
| 4K | $0.40 | 40 |

100 credits = $1. Charged once, only for the route that succeeds; failed generations cost nothing.

## Request

POST https://api.revana.si/v1/generations with `Authorization: Bearer $REVANA_API_KEY` and an `Idempotency-Key` header: one key per request, made once and sent again on every resend after a timeout, a 429 or a 5xx, so the request is never made or charged twice. After a generation has failed, use a new key.

```json
{
  "model": "ltx-2.5-fast",
  "input": {
    "prompt": "A slow dolly shot through a neon-lit night market in the rain, steam rising from food stalls",
    "resolution": "720p",
    "duration": 8
  },
  "max_cost_usd": 1.5
}
```

`max_cost_usd` is your cap, the most this request may cost (it lists at $0.96). Poll `GET /v1/generations/{id}` until `status` is `succeeded` or `failed`, then download `GET /v1/generations/{id}/content`. Full API: https://revana.si/llms.txt

## Similar models

- [LTX 2.5 Pro](https://revana.si/models/ltx-2.5-pro.md): from $0.16 per second of video
- [Seedance 2.5](https://revana.si/models/seedance-2.5.md): from $0.09 per second of video
- [Seedance 2.5 Fast](https://revana.si/models/seedance-2.5-fast.md): from $0.10 per second of video
- [Wan 3.0](https://revana.si/models/wan-3.0.md): from $0.04 per second of video
- [Wan 3.0 Prime](https://revana.si/models/wan-3.0-prime.md): from $0.07 per second of video
- [Nemesis (aka Genjutsu)](https://revana.si/models/nemesis.md): from $0.08 per second of video