---
title: flux-1-schnell
description: FLUX.1 [schnell] is a 12 billion parameter rectified flow transformer capable of generating images from text descriptions. 
image: https://developers.cloudflare.com/dev-products-preview.png
---

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![Black Forest Labs logo](https://developers.cloudflare.com/_astro/blackforestlabs.Ccs-Y4-D.svg) 

#  flux-1-schnell 

Text-to-Image • Black Forest Labs 

`@cf/black-forest-labs/flux-1-schnell` 

FLUX.1 \[schnell\] is a 12 billion parameter rectified flow transformer capable of generating images from text descriptions. 

| Model Info        |                                                  |
| ----------------- | ------------------------------------------------ |
| Terms and License | [link ↗](https://bfl.ai/legal/terms-of-service)  |
| Unit Pricing      | $0.000053 per 512 by 512 tile, $0.00011 per step |

## Usage

* [  Worker (Data URI) ](#tab-panel-4994)
* [  Worker (Image) ](#tab-panel-4995)
* [  curl ](#tab-panel-4996)

TypeScript

```
export interface Env {  AI: Ai;}
export default {  async fetch(request, env): Promise<Response> {    const response = await env.AI.run('@cf/black-forest-labs/flux-1-schnell', {      prompt: 'a cyberpunk lizard',      seed: Math.floor(Math.random() * 10)    });    // response.image is base64 encoded which can be used directly as an <img src=""> data URI    const dataURI = `data:image/jpeg;charset=utf-8;base64,${response.image}`;    return Response.json({ dataURI });  },} satisfies ExportedHandler<Env>;
```

TypeScript

```
export interface Env {  AI: Ai;}
export default {  async fetch(request, env): Promise<Response> {    const response = await env.AI.run('@cf/black-forest-labs/flux-1-schnell', {      prompt: 'a cyberpunk lizard',      seed: Math.floor(Math.random() * 10)    });    // Convert from base64 string    const binaryString = atob(response.image);    // Create byte representation    const img = Uint8Array.from(binaryString, (m) => m.codePointAt(0));    return new Response(img, {      headers: {        'Content-Type': 'image/jpeg',      },    });  },} satisfies ExportedHandler<Env>;
```

Terminal window

```
curl https://api.cloudflare.com/client/v4/accounts/$CLOUDFLARE_ACCOUNT_ID/ai/run/@cf/black-forest-labs/flux-1-schnell  \  -X POST  \  -H "Authorization: Bearer $CLOUDFLARE_API_TOKEN"  \  -d '{ "prompt": "cyberpunk cat", "seed": "Random positive integer" }'
```

## Parameters

* [ Input ](#tab-panel-4997)
* [ Output ](#tab-panel-4998)

prompt

`string`requiredminLength: 1maxLength: 2048A text description of the image you want to generate.

steps

`integer`default: 4maximum: 8The number of diffusion steps; higher values can improve quality but take longer.

image

`string`The generated image in Base64 format.

## API Schemas (Raw)

Input [ ](https://developers.cloudflare.com/workers-ai/models/flux-1-schnell/schema-input.json "Open") [ ](https://developers.cloudflare.com/workers-ai/models/flux-1-schnell/schema-input.json "Download") 

Output [ ](https://developers.cloudflare.com/workers-ai/models/flux-1-schnell/schema-output.json "Open") [ ](https://developers.cloudflare.com/workers-ai/models/flux-1-schnell/schema-output.json "Download")

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```