# Seedance 2.5 Fast API

> Seedance 2.5 on dedicated, faster compute: your renders start straight away on capacity kept for this model instead of queueing behind shared traffic, so each video comes back sooner and large batches run side by side. 480p, 720p and 1080p, up to 30 seconds with sound, reference images and audio, and first and last frames. By ByteDance, on Revana from $0.10 per second of video.

- Model id: `seedance-2.5-fast`
- Kind: video
- Maker: ByteDance
- Tasks: Text to video, Image to video, First + last frame, Reference to video, Video to video
- Resolutions: 480p, 720p, 1080p
- Durations: 4 to 30 seconds
- Aspect ratios: 16:9, 9:16, 1:1, 4:3, 3:4, 21:9, adaptive
- Audio: supported (`"audio": true`)
- Input images: up to 30
- Routes: 3 (starts on the cheapest, falls back automatically)
- Status: live on the API
- Page: https://revana.si/models/seedance-2.5-fast

## Price (per second of video, USD)

| Resolution | Price | Credits |
|---|---|---|
| 480p | $0.10 | 10 |
| 720p | $0.245 | 25 |
| 1080p | $0.55 | 55 |
| 480p + with video input | $0.06 | 6 |
| 720p + with video input | $0.15 | 15 |
| 1080p + with video input | $0.34 | 34 |

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": "seedance-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": 4,
    "aspect_ratio": "16:9",
    "audio": true
  },
  "max_cost_usd": 1.5
}
```

`max_cost_usd` is your cap, the most this request may cost (it lists at $0.98). 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

- [Seedance 2.5](https://revana.si/models/seedance-2.5.md): from $0.09 per second of video
- [Seedance 2.0](https://revana.si/models/seedance-2.0.md): from $0.08 per second of video
- [Seedream 5.5](https://revana.si/models/seedream-5.5.md): from $0.02 per image
- [Seedream 4.5](https://revana.si/models/seedream-4.5.md): from $0.04 per image
- [Seedream 5.0 Pro](https://revana.si/models/seedream-5.0-pro.md): from $0.04 per image
- [ByteDance Lip Sync](https://revana.si/models/bytedance-lipsync.md): from $0.05 per second of video