Flux.2 Klein 4B - Unifically

Generate images using the smallest and fastest Flux.2 Klein 4B model.

Model

black-forest-labs/flux.2-klein-4b

Parameters

Parameter	Type	Required	Default	Description
`prompt`	string	Yes	-	Text description of the image
`aspect_ratio`	string	No	`"16:9"`	`"21:9"`, `"16:9"`, `"4:3"`, `"1:1"`, `"3:4"`, `"9:16"`, `"9:21"`
`resolution`	string	No	`"1mp"`	`"0.6mp"`, `"1mp"`, `"2mp"`, `"4mp"`
`image_urls`	string[]	No	`null`	Reference image URLs
`seed`	integer	No	random	Seed for reproducibility

Klein models do not support guidance, steps, or prompt_upsampling.

Example Request

curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "black-forest-labs/flux.2-klein-4b",
    "input": {
      "prompt": "A simple icon of a coffee cup",
      "aspect_ratio": "1:1"
    }
  }'

Response

{
  "code": 200,
  "success": true,
  "data": {
    "task_id": "abc123def456",
    "status": "processing"
  }
}

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