Documentation Index
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Fastest image generation with Flux.2 Klein 4B. See supported inputs, parameters, pricing, response fields, and API examples.
black-forest-labs/flux.2-klein-4b
| 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 |
nsfw_check | boolean | No | true | Check uploaded media inputs for NSFW content |
guidance, steps, or prompt_upsampling.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"
}
}'
{
"code": 200,
"success": true,
"data": {
"task_id": "abc123def456",
"status": "processing"
}
}