# FLUX.2 [klein] 9B — Edit

> Image-to-image editing with FLUX.2 [klein] 9B from Black Forest Labs. Precise modifications using natural language descriptions and hex color control.

## Overview

- **Endpoint**: `https://api.runflow.io/v1/run/black-forest-labs/flux-2-klein-9b/edit`
- **Model ID**: `black-forest-labs/flux-2-klein-9b/edit`
- **Provider**: Black Forest Labs
- **License**: commercial
- **Last Updated**: 2026-04-08

## Pricing

- **Base price**: $0.011/megapixel
- **Note**: Per megapixel (input + output)
## Input Schema

### `prompt` (string, required)



### `image_urls` (array, required)



### `seed` (integer, optional)



### `num_inference_steps` (integer, optional)


- **Default**: `4`

### `image_size` (string, optional)



### `num_images` (integer, optional)


- **Default**: `1`

### `sync_mode` (boolean, optional)


- **Default**: `false`

### `enable_safety_checker` (boolean, optional)


- **Default**: `true`

### `output_format` (string, optional)


- **Default**: `png`
- **Options**: `jpeg`, `png`, `webp`

## Usage Examples

### cURL

```bash
curl -X POST https://api.runflow.io/v1/run/black-forest-labs/flux-2-klein-9b/edit \
  -H "Authorization: Bearer $RUNFLOW_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "prompt": "A professional headshot, soft studio lighting",
    "output_format": "png"
  }'
```

### Python

```python
import requests

response = requests.post(
    "https://api.runflow.io/v1/run/black-forest-labs/flux-2-klein-9b/edit",
    headers={"Authorization": "Bearer RUNFLOW_API_KEY"},
    json={
        "prompt": "A professional headshot, soft studio lighting",
        "output_format": "png",
    },
)

data = response.json()
print(data["images"][0]["url"])
```

### JavaScript

```javascript
const response = await fetch(
  "https://api.runflow.io/v1/run/black-forest-labs/flux-2-klein-9b/edit",
  {
    method: "POST",
    headers: {
      "Authorization": "Bearer RUNFLOW_API_KEY",
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
      prompt: "A professional headshot, soft studio lighting",
      output_format: "png",
    }),
  }
);

const data = await response.json();
console.log(data.images[0].url);
```

## Additional Resources

- [Playground](https://www.runflow.io/models/black-forest-labs/flux-2-klein-9b/edit)
- [API Reference](https://www.runflow.io/models/black-forest-labs/flux-2-klein-9b/edit/api)
- [Documentation](https://www.runflow.io/docs)