---
title: flux-2-klein-9b
description: FLUX.2 [klein] 9B is an ultra-fast, distilled image model with enhanced quality. It unifies image generation and editing in a single model, delivering state-of-the-art quality enabling interactive workflows, real-time previews, and latency-critical applications.
image: https://developers.cloudflare.com/dev-products-preview.png
---

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#  flux-2-klein-9b 

Text-to-Image • Black Forest Labs 

`@cf/black-forest-labs/flux-2-klein-9b` 

FLUX.2 \[klein\] 9B is an ultra-fast, distilled image model with enhanced quality. It unifies image generation and editing in a single model, delivering state-of-the-art quality enabling interactive workflows, real-time previews, and latency-critical applications.

| Model Info        |                                                                                      |
| ----------------- | ------------------------------------------------------------------------------------ |
| Terms and License | [link ↗](https://bfl.ai/legal/terms-of-service)                                      |
| Partner           | Yes                                                                                  |
| Unit Pricing      | $0.015 per first MP (1024x1024), $0.002 per subsequent MP, $0.002 per input image MP |

## Usage

* [  TypeScript ](#tab-panel-5007)
* [  curl ](#tab-panel-5008)

```
export interface Env {  AI: Ai;}
export default {  async fetch(request, env): Promise<Response> {    const form = new FormData();    form.append('prompt', 'a sunset with a dog');    form.append('width', '1024');    form.append('height', '1024');
    // FormData doesn't expose its serialized body or boundary. Passing it to a    // Request (or Response) constructor serializes it and generates the Content-Type    // header with the boundary, which is required for the server to parse the multipart fields.    const formResponse = new Response(form);    const formStream = formResponse.body;    const formContentType = formResponse.headers.get('content-type')!;
    const resp = await env.AI.run("@cf/black-forest-labs/flux-2-klein-9b", {      multipart: {        body: formStream,        contentType: formContentType      }    });
    return Response.json(resp);  },} satisfies ExportedHandler<Env>;
```

Terminal window

```
curl --request POST \  --url 'https://api.cloudflare.com/client/v4/accounts/{ACCOUNT}/ai/run/@cf/black-forest-labs/flux-2-klein-9b' \  --header 'Authorization: Bearer {TOKEN}' \  --header 'Content-Type: multipart/form-data' \  --form 'prompt=a sunset at the alps' \  --form steps=25 \  --form width=1024 \  --form height=1024
```

## Parameters

* [ Input ](#tab-panel-5009)
* [ Output ](#tab-panel-5010)

▶multipart{}

`object`required

image

`string`Generated image as Base64 string.

## API Schemas (Raw)

Input [ ](https://developers.cloudflare.com/workers-ai/models/flux-2-klein-9b/schema-input.json "Open") [ ](https://developers.cloudflare.com/workers-ai/models/flux-2-klein-9b/schema-input.json "Download") 

Output [ ](https://developers.cloudflare.com/workers-ai/models/flux-2-klein-9b/schema-output.json "Open") [ ](https://developers.cloudflare.com/workers-ai/models/flux-2-klein-9b/schema-output.json "Download")

```json
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```