falText to imageComing soon

fal-ai/flux-2/klein/4b/base

Name: fal-ai/flux-2/klein/4b/base
Brand: fal

fal-ai/flux-2/klein/4b/base is a text to image tool from fal that runs in the background and returns images. Coming soon: listed with its price, not yet open to runs.

This tool is listed but not yet available to run.

Priced by usage

Pricing

$0.0117 per megapixel. Each image_size preset counts as 1 MP, and a custom width × height rounds up to whole megapixels. Billed on num_images, default 1. The final charge comes from usage.

Limits

Runs: In the background
Returns: image
Longest queue wait: 3600s
Run deadline: 1800s
Largest inline input: 1024 KB
Largest input file: 500 MB
Largest output: 4768 MB
Outputs per run: 16

Input

Field	Kind	Default	Description
`prompt` required	text	—	The prompt to generate an image from.
`negative_prompt`	text		Negative prompt for classifier-free guidance. Describes what to avoid in the image.
`guidance_scale`	number 0 to 20	5	Guidance scale for classifier-free guidance.
`seed`	number (whole)	—	The seed to use for the generation. If not provided, a random seed will be used.
`num_inference_steps`	number (whole) 4 to 50	28	The number of inference steps to perform.
`image_size`	JSON	landscape_4_3	The size of the image to generate.
`num_images`	number (whole) 1 to 4	1	The number of images to generate.
`acceleration`	one of none, regular, high	regular	The acceleration level to use for image generation.
`output_format`	one of jpeg, png, webp	png	The format of the generated image.

Same request in code

curl https://api.spiral.ai/v1/runs \
  -H "Authorization: Bearer $SPIRAL_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
    "provider": "fal",
    "model": "fal-ai/flux-2/klein/4b/base",
    "input": {
      "prompt": "Japanese zen garden at first light, perfect rake lines in gravel, koi pond with morning mist, temple bell in background, meditation ready"
    }
  }'