GET

/v1/schemas/fal/image/fal-ai%2Fflux-1%2Fschnell

kind inputactivity imagehash a524df3dextracted Jul 6, 2026version currentsource upstream spec ↗

Request body

10 properties · 1 required · 1 $defs
propertytypedescriptionconstraints
prompt*stringThe prompt to generate an image from.
accelerationenumThe speed of the generation. The higher the speed, the faster the generation.none | regular | high · default: "none"
num_imagesintegerThe number of images to generate.1 ≤ n ≤ 4 · default: 1
image_sizeImageSize | enumThe size of the generated image.default: "landscape_4_3"
enable_safety_checkerbooleanIf set to true, the safety checker will be enabled.default: true
seedinteger The same seed and the same prompt given to the same version of the model will output the same image every time. nullable
output_formatenumThe format of the generated image.jpeg | png · default: "jpeg"
sync_modebooleanIf `True`, the media will be returned as a data URI and the output data won't be available in the request history.default: false
num_inference_stepsintegerThe number of inference steps to perform.1 ≤ n ≤ 12 · default: 4
guidance_scalenumberThe CFG (Classifier Free Guidance) scale is a measure of how close you want the model to stick to your prompt when looking for a related image to show you.1 ≤ n ≤ 20 · default: 3.5

Validate a payload

before you spend tokens
shell
$ curl -X POST https://modelschemas.com/v1/validate \
    -d '{"provider":"fal","endpointId":"fal-ai/flux-1/schnell","payload":{…}}'
→ {"valid": false, "errors": [{"path": "#", "keyword": "required", …}]}