# Flux.1 Kontext API

> In-context image generation and precise editing.

- **Provider**: Black Forest Labs
- **Model id**: `flux-kontext`
- **Modality**: image
- **Price**: 5.34 credits

## Overview

Flux.1 Kontext 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-kontext` |
| 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 |
|-----------|------|----------|-------------|
| imageUrl | string | No | Image URL |
| prompt | string | Yes | Text value (default: A cozy reading nook inside a treehouse at dusk, string lights, rain on the round window, storybook illustration.) |
| enableTranslation | boolean | No | True/false (default: true) |
| aspectRatio | string | Yes | Options: 16:9 | 21:9 | 4:3 | 1:1 | 3:4 | 9:16 (default: 1:1) |
| outputFormat | string | Yes | Options: JPEG | PNG (default: JPEG) |

### Request example

```json
{
  "modelId": "flux-kontext",
  "input": {
    "imageUrl": "https://example.com/input.jpg",
    "prompt": "A photorealistic portrait of a red fox in a snowy forest, soft morning light, shallow depth of field, 85mm.",
    "enableTranslation": true,
    "aspectRatio": "1:1",
    "outputFormat": "JPEG"
  }
}
```

### Response example

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

## Query Task

`GET https://you.bot/api/v1/task/{taskId}?model=flux-kontext`

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 |