# FLUX.2 API

> FLUX.2 — fast, high-fidelity AI image generation & editing.

- **Provider**: Black Forest Labs
- **Model id**: `flux-2-pro-text-to-image`
- **Modality**: image
- **Price**: 2.84–4.12 credits

## Overview

FLUX.2 is called in two steps: create a generation task, then poll the task until the result is ready.

## Authentication

All requests require a Bearer Token in the request header:

```
Authorization: Bearer YOUR_API_KEY
```

## Create Task

`POST https://you.bot/api/v1/generate`

| Parameter | Type | Required | Description |
|-----------|------|----------|-------------|
| modelId | string | Yes | Model id: `flux-2-pro-text-to-image` |
| input | object | Yes | Input parameters object (see below) |
| callbackUrl | string | No | https URL to receive a signed webhook on completion |

### input object parameters

| Parameter | Type | Required | Description |
|-----------|------|----------|-------------|
| prompt | string | Yes | Must be between 3 and 5000 characters. (default: Hyperrealistic studio photo of a glass terrarium shaped like a vintage camera, a tiny forest growing inside, product lighting.) |
| aspect_ratio | string | Yes | Aspect ratio for the generated image. Select 'auto' to match the first input image ratio (requires input image). (options: 1:1 | 4:3 | 3:4 | 16:9 | 9:16 | 3:2 | 2:3) (default: 1:1) |
| resolution | string | Yes | Output image resolution. (options: 1K | 2K) (default: 1K) |
| nsfw_checker | boolean | No | A configurable parameter. Defaults to true in the Playground. (true/false) (default: true) |

### Request example

```json
{
  "modelId": "flux-2-pro-text-to-image",
  "input": {
    "prompt": "A photorealistic portrait of a red fox in a snowy forest, soft morning light, shallow depth of field, 85mm.",
    "aspect_ratio": "1:1",
    "resolution": "1K",
    "nsfw_checker": true
  }
}
```

### Response example

```json
{
  "taskId": "281e5b0…f39b9",
  "creditsCharged": 24
}
```

## Query Task

`GET https://you.bot/api/v1/task/{taskId}?model=flux-2-pro-text-to-image`

When `state` is `success`, the output is in `resultUrls`: `{ "state": "success", "resultUrls": [ ... ] }`. (Text models return inline in the create response.)

## Error Codes

| Code | Description |
|------|-------------|
| 200 | Request successful |
| 400 | Invalid request parameters |
| 401 | Authentication failed, check API Key |
| 402 | Insufficient account balance |
| 422 | Parameter validation failed |
| 429 | Request rate limit exceeded |
| 500 | Internal server error |