FLUX.3 Klein

Liveby Black Forest Labs

Generates images from text prompts with FLUX.3 Klein, with configurable image size, reproducible seeds, prompt expansion and optional bounding-box layout control.

Guide: Image generation API prices

Ask your agent

Say it in your own words. Your agent picks this tool, fills in the details and brings back the answer.

Make an image with FLUX.3 Klein: a cozy coffee shop in São Paulo at golden hour.

Create a product photo of our new sneaker on a white background.

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How it works

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Pay only when it worksEach use comes out of your balance. If it fails, you aren't charged.

For developersSummary, tool id, API call and input schema

Image generation API by Black Forest Labs, callable through Superpowers. It costs $0.00864 per image, charged only when the call succeeds. Call it with one API key: POST /v1/run with "tool": "fal.blackforestlabs-flux-3-klein-text-to-image", or over MCP with run_tool. 84 other providers in this category take the same input and can be compared side by side.

Tool id
Price per call: $0.00864 / image

Call it

Also over MCP as run_tool

curl -X POST https://superpowers.tools/v1/run \
  -H 'Authorization: Bearer $SP_KEY' \
  -d '{"tool":"fal.blackforestlabs-flux-3-klein-text-to-image","input":{"prompt":""},"idempotency_key":"example-request-1"}'

Input

9 fields · 1 required

{
  "type": "object",
  "required": [
    "prompt"
  ],
  "properties": {
    "image_size": {
      "type": "string",
      "description": "The size of the generated image. Each side can be 256 to 4096 pixels (native 4K).",
      "default": "square_hd",
      "enum": [
        "square_hd",
        "square",
        "portrait_4_3",
        "portrait_16_9",
        "landscape_4_3",
        "landscape_16_9"
      ]
    },
    "prompt": {
      "type": "string",
      "description": "The prompt to generate an image from. The model is trained on detailed captions: describe framing, subject, background and lighting."
    },
    "seed": {
      "type": "integer",
      "description": "The same seed and the same prompt given to the same version of the model will output the same image every time."
    },
    "sync_mode": {
      "type": "boolean",
      "description": "If `True`, the media will be returned as a data URI and the output data won't be available in the request history.",
      "default": false
    },
    "bounding_boxes": {
      "type": "array",
      "description": "Optional layout: draw each described object inside its box. Box edges are fractions of the image size, with (0, 0) at the top-left. Name boxes in the prompt by label, e.g. `A red fox <fox> sits under a red umbrella <umbrella>`."
    },
    "num_images": {
      "type": "integer",
      "description": "The number of images to generate.",
      "default": 1
    },
    "output_format": {
      "type": "string",
      "description": "The format of the generated image.",
      "default": "png",
      "enum": [
        "jpeg",
        "png",
        "webp"
      ]
    },
    "enable_prompt_expansion": {
      "type": "boolean",
      "description": "If set to true, the prompt is expanded into a detailed caption (grounded in the reference images when editing) before generation.",
      "default": true
    },
    "enable_safety_checker": {
      "type": "boolean",
      "description": "If set to true, the safety checker will be enabled.",
      "default": true
    }
  }
}