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FLUX Schnell API

Generate images from text prompts for illustrations and visual drafts.

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Black Forest Labs · flux-schnell

Text to image

Generate images from text prompts for illustrations and visual drafts.

Put a prompt and "model": "flux-schnell" on an image clip, and the render generates it and edits it into the video. To generate it on its own, send the same asset to the generate endpoint.

Built forQuick drafts · Illustrations · Testing prompts cheaply

FLUX Schnell output: A pair of white canvas sneakers on a deep green backdrop
FLUX Schnell “A pair of white canvas sneakers on a deep green backdrop”
Technical specifications
InputText prompt
OutputImage
{
  "asset": {
    "type": "image",
    "prompt": "A pair of white canvas sneakers on a deep green backdrop",
    "model": "flux-schnell"
  },
  "length": 5
}
Example request to the generate endpoint.

Options

FLUX Schnell takes no options. The prompt is all it needs.

Pricing

Generation is paid in credits from the same balance as rendering, at what the model's provider charges plus a small margin. See AI generation pricing.

ModeCharged perPrice changes withLength a quote assumes without one
Text to imageImageFixed price—

Get a quote

POST /generate/quote takes the same body as the generate endpoint and returns what that generation would cost. Nothing is generated, reserved or charged.

curl -X POST \
     -H "Content-Type: application/json" \
     -H "x-api-key: $SHOTSTACK_API_KEY" \
     -d '{
       "asset": {
         "type": "image",
         "prompt": "A pair of white canvas sneakers on a deep green backdrop",
         "model": "flux-schnell"
       },
       "length": 5
     }' \
     https://api.shotstack.io/edit/stage/generate/quote

The response gives credits, the price of that request, and ceiling, which is true when the request has no length for a model charged by length, so the price is an estimate. Prices follow the providers, so ask again rather than storing one.

How it compares

FLUX Schnell beside the other models in Shotstack that make the same thing.

ModelBest forModesMax resolutionAspect ratiosReference imagesSeedCharged per
FLUX SchnellQuick, low-cost drafts and illustrationsText to image————Image, fixed price
Nano Banana 2Fast iteration, accurate text, product and campaign visualsText to image, Image to image4K14Up to 14YesImage
Nano Banana ProComplex compositions and precise typography, over speedText to image4K10—YesImage
GPT Image 2.5 SunburstHighly detailed images that follow complex prompts; slowerText to image, Image to image4K10Up to 16—Image

Questions

Do I need an account with the model provider?
No. Generation runs on your Shotstack API key and is paid in credits from the same balance as rendering, so there is no separate account to open and nothing extra to integrate.
Do I pay again for the same asset?
No. Every generated file is stored against your account. An asset with the same type, model, prompt, options and length as one generated before reuses the stored file at no charge.
What happens if a generation fails?
A failed generation isn't charged. If a render fails after some of its assets were generated, those assets are kept, and rendering again reuses them at no charge.
Can I generate an asset without rendering a video?
Yes. POST the asset to the generate endpoint and you get back a URL to the file, to check it before you render, to reuse it across many edits, or to use it outside Shotstack.

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