# Flux 3 Klein API

> Black Forest Labs's Flux 3 Klein: text to image and image editing, up to 4K. By Black Forest Labs, on Revana from $0.01 per image.

- Model id: `flux-3-klein`
- Kind: image
- Maker: Black Forest Labs
- Tasks: Text to image, Image to image
- Resolutions: 768SQ, 1K, 1.5K, 2K, 4K
- Aspect ratios: 1:1, 4:3, 3:4, 3:2, 2:3, 16:9, 9:16, 21:9, 9:21, auto
- Input images: up to 10
- Routes: 2 (starts on the cheapest, falls back automatically)
- Status: live on the API
- Page: https://revana.si/models/flux-3-klein

## Price (per image, USD)

| Setting | Price | Credits |
|---|---|---|
| 768SQ | $0.01 | 1 |
| 1K | $0.01 | 1 |
| 1.5K | $0.02 | 2 |
| 2K | $0.02 | 2 |
| 4K | $0.04 | 4 |

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`:

```json
{
  "model": "flux-3-klein",
  "input": {
    "prompt": "A product photo of a ceramic coffee cup on a linen tablecloth, soft morning light",
    "resolution": "1K",
    "aspect_ratio": "16:9"
  }
}
```

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

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