Black Forest Labs: FLUX 3 Image Klein

Provider-supported parameters

These are upstream capabilities. Jevrouter supports the subset described in the API contract; chat input is currently text only.

Capabilities are imported from OpenRouter’s catalog. This does not mean every model has been independently tested by Jevrouter.

Catalog updated: 2026-10-15T19:21:57.077Z · Price version: cmv9t38ep0r7qju0zk04hwyy5:1

Image prices & options

Prices use each provider’s billing unit. We reserve a conservative amount and settle from the usage receipt, releasing unused balance.

{
  "n": {
    "type": "range",
    "min": 1,
    "max": 1
  },
  "resolution": {
    "type": "enum",
    "values": [
      "768",
      "1K",
      "1.5K",
      "2K",
      "4K"
    ]
  },
  "aspect_ratio": {
    "type": "enum",
    "values": [
      "21:9",
      "2:1",
      "16:9",
      "3:2",
      "7:5",
      "4:3",
      "5:4",
      "1:1",
      "4:5",
      "3:4",
      "5:7",
      "2:3",
      "9:16",
      "1:2",
      "9:21",
      "auto"
    ]
  },
  "input_references": {
    "type": "range",
    "min": 0,
    "max": 10
  }
}

Some models require reference images. Check the input_references range above. Images return base64 data and a usage receipt.

curl --no-buffer https://api.jevrouter.io/v1/images \
  -H "Authorization: Bearer $JEVROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d @- <<'JSON'
{
  "model": "black-forest-labs/flux-3-image-klein",
  "prompt": "A quiet mountain cabin at sunrise, watercolor illustration",
  "n": 1,
  "stream": true
}
JSON

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