> ## Documentation Index
> Fetch the complete documentation index at: https://docs.aireiter.com/llms.txt
> Use this file to discover all available pages before exploring further.

# FLUX 3 Klein 图片生成

> - 异步处理模式，返回任务ID用于后续查询
- Black Forest Labs 于 2026 年 10 月发布的 FLUX 3 Image 轻量开源权重版本（5.6B 参数），主打快速改图，也支持文生图
- 支持文生图和图生图，传入 image_url 后自动切换为图生图
- 支持最多 3 张参考图，第一张为被编辑的图，其余提供主体、商品和风格参考
- 生成前会自动扩写提示词
- 支持 7 种常用图片比例
- 支持 1K / 2K 分辨率档位，单次最多生成 4 张
- 提交的 prompt 会经过平台敏感词 / 安全审核，违规内容会被直接拒绝


## Authorizations

**Authorization** `string` *required*

所有接口均需要使用 Bearer Token 进行认证。

获取 API Key：

访问 [API Key 管理页面](https://aireiter.com/keys) 获取您的 API Key。

使用时在请求头中添加：

```
Authorization: Bearer YOUR_API_KEY
```

## Body

**model** `string` *required*

模型名称。

固定值：`"flux_3_klein"`

**params** `object` *required*

模型参数对象。

**params 对象属性**

**prompt** `string` *required*

图片生成或编辑指令，最多 4000 个字符。

* 支持中英文，建议明确描述主体、场景、构图、光线、材质和需要保留的参考图特征
* 图生图时，应在提示词中明确说明需要保留和需要修改的内容
* 模型在生成前会自动扩写提示词，提示词只需写清意图，无需堆叠修饰词
* 提交前会经过平台敏感词 / 安全审核，命中违规内容会直接返回错误

**image\_url** `string[]`

参考图数组。传入后自动使用图生图模式；不传时使用文生图模式。

* 最多 3 张参考图，第一张是被编辑的图，其余用于提供主体、商品或风格参考
* 单张图片最大 10MB
* 支持 jpeg、png、webp
* 支持以下两种格式：
  1. 公开可访问的 URL
  2. 完整的 Base64 Data URI，例如 `data:image/jpeg;base64,/9j/4AAQ...`

> [!WARNING]
>
> URL 必须可以被公网直接访问，不能要求登录、Cookie 或临时页面授权。

**aspect\_ratio** `string` (default: 1:1)

图片宽高比。

支持以下取值：

* `1:1` - 正方形（默认）
* `5:4` / `4:5` - 小幅横版 / 竖版
* `4:3` / `3:4` - 标准横版 / 竖版
* `16:9` / `9:16` - 宽屏横版 / 竖版

> [!WARNING]
>
> `aspect_ratio` 表示模型的目标比例档位，不承诺固定像素尺寸，返回的是接近该比例的模型原生尺寸。

**resolution** `string` (default: 1K)

图片分辨率档位。

* `1K` - 基础分辨率（默认）
* `2K` - 高清分辨率

**output\_n** `string` (default: 1)

生成张数。

支持以下取值：

* `"1"` - 生成 1 张（默认）
* `"2"` - 生成 2 张
* `"4"` - 生成 4 张

**out\_task\_id** `string` *required*

调用方自定义任务 ID，用于幂等提交和查询结果。

* 长度为 1-64 个字符
* 只允许字母、数字、下划线和连字符
* 同一个 API Key 下不能重复使用

## Response

**out\_task\_id** `string`

调用方任务 ID，可用于查询结果。

**status** `string`

初始状态，固定为 `"pending"`。

**created\_at** `string`

创建时间，ISO 8601 格式。

## 查询结果

提交成功后，使用相同的 `out_task_id` 调用：

```bash theme={null}
curl --request POST \
  --url https://aireiter.com/api/openapi/query \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
    "out_task_id": "flux_3_klein_task_001"
  }'
```

任务状态包括 `pending`、`processing`、`completed` 和 `failed`。任务完成后，结果图片位于 `data.output`，生成多张时为多个图片 URL 组成的数组。

```bash cURL（文生图） theme={null}
curl --request POST \
  --url https://aireiter.com/api/openapi/submit \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
    "model": "flux_3_klein",
    "params": {
      "prompt": "一辆未来感电动跑车停在现代玻璃建筑前，蓝调时刻，潮湿地面反射建筑灯光，商业汽车摄影，真实材质与自然阴影，无文字，无水印",
      "aspect_ratio": "16:9",
      "resolution": "2K",
      "output_n": "2"
    },
    "out_task_id": "flux_3_klein_task_001"
  }'
```

```bash cURL（图生图） theme={null}
curl --request POST \
  --url https://aireiter.com/api/openapi/submit \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
    "model": "flux_3_klein",
    "params": {
      "prompt": "将第一张参考图中的商品瓶身改为高级夜间广告风格，保持瓶身形状、比例、喷头、透明玻璃结构和标签文字，商品外观参考第二张图，背景与光线参考第三张图",
      "image_url": [
        "https://example.com/product-original.png",
        "https://example.com/product-texture.png",
        "https://example.com/style-reference.png"
      ],
      "aspect_ratio": "16:9",
      "resolution": "1K",
      "output_n": "2"
    },
    "out_task_id": "flux_3_klein_image_task_001"
  }'
```

```python Python theme={null}
import requests

url = "https://aireiter.com/api/openapi/submit"

payload = {
    "model": "flux_3_klein",
    "params": {
        "prompt": "电影感产品广告摄影，玻璃香水瓶置于黑色石台上，真实反射与自然阴影",
        "aspect_ratio": "16:9",
        "resolution": "1K",
        "output_n": "1"
    },
    "out_task_id": "flux_3_klein_python_001"
}

headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)
print(response.json())
```

```javascript JavaScript theme={null}
const response = await fetch("https://aireiter.com/api/openapi/submit", {
  method: "POST",
  headers: {
    Authorization: "Bearer <token>",
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    model: "flux_3_klein",
    params: {
      prompt: "电影感产品广告摄影，玻璃香水瓶置于黑色石台上，真实反射与自然阴影",
      aspect_ratio: "16:9",
      resolution: "1K",
      output_n: "1"
    },
    out_task_id: "flux_3_klein_javascript_001"
  })
});

console.log(await response.json());
```

```go Go theme={null}
package main

import (
    "bytes"
    "fmt"
    "io"
    "net/http"
)

func main() {
    payload := []byte(`{
      "model":"flux_3_klein",
      "params":{
        "prompt":"电影感产品广告摄影，玻璃香水瓶置于黑色石台上，真实反射与自然阴影",
        "aspect_ratio":"16:9",
        "resolution":"1K"
      },
      "out_task_id":"flux_3_klein_go_001"
    }`)

    req, _ := http.NewRequest(
        http.MethodPost,
        "https://aireiter.com/api/openapi/submit",
        bytes.NewBuffer(payload),
    )
    req.Header.Set("Authorization", "Bearer <token>")
    req.Header.Set("Content-Type", "application/json")

    response, err := http.DefaultClient.Do(req)
    if err != nil {
        panic(err)
    }
    defer response.Body.Close()

    body, _ := io.ReadAll(response.Body)
    fmt.Println(string(body))
}
```

```java Java theme={null}
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

public class Main {
    public static void main(String[] args) throws Exception {
        String payload = """
        {
          "model": "flux_3_klein",
          "params": {
            "prompt": "电影感产品广告摄影，玻璃香水瓶置于黑色石台上，真实反射与自然阴影",
            "aspect_ratio": "16:9",
            "resolution": "1K"
          },
          "out_task_id": "flux_3_klein_java_001"
        }
        """;

        HttpRequest request = HttpRequest.newBuilder()
            .uri(URI.create("https://aireiter.com/api/openapi/submit"))
            .header("Authorization", "Bearer <token>")
            .header("Content-Type", "application/json")
            .POST(HttpRequest.BodyPublishers.ofString(payload))
            .build();

        HttpResponse<String> response = HttpClient.newHttpClient().send(
            request,
            HttpResponse.BodyHandlers.ofString()
        );
        System.out.println(response.body());
    }
}
```

```php PHP theme={null}
<?php

$payload = [
    "model" => "flux_3_klein",
    "params" => [
        "prompt" => "电影感产品广告摄影，玻璃香水瓶置于黑色石台上，真实反射与自然阴影",
        "aspect_ratio" => "16:9",
        "resolution" => "1K"
    ],
    "out_task_id" => "flux_3_klein_php_001"
];

$ch = curl_init("https://aireiter.com/api/openapi/submit");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($payload));
curl_setopt($ch, CURLOPT_HTTPHEADER, [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
]);

echo curl_exec($ch);
curl_close($ch);
?>
```

```ruby Ruby theme={null}
require 'net/http'
require 'json'
require 'uri'

url = URI("https://aireiter.com/api/openapi/submit")

payload = {
  model: "flux_3_klein",
  params: {
    prompt: "一辆未来感电动跑车停在现代玻璃建筑前，蓝调时刻，潮湿地面反射建筑灯光，商业汽车摄影，真实材质与自然阴影，无文字，无水印",
    aspect_ratio: "16:9",
    resolution: "2K"
  },
  out_task_id: "flux_3_klein_task_001"
}

http = Net::HTTP.new(url.host, url.port)

request = Net::HTTP::Post.new(url)
request["Authorization"] = "Bearer <token>"
request["Content-Type"] = "application/json"
request.body = payload.to_json

response = http.request(request)
puts response.body
```

```swift Swift theme={null}
import Foundation

let url = URL(string: "https://aireiter.com/api/openapi/submit")!

let payload: [String: Any] = [
    "model": "flux_3_klein",
    "params": [
        "prompt": "一辆未来感电动跑车停在现代玻璃建筑前，蓝调时刻，潮湿地面反射建筑灯光，商业汽车摄影，真实材质与自然阴影，无文字，无水印",
        "aspect_ratio": "16:9",
        "resolution": "2K"
    ],
    "out_task_id": "flux_3_klein_task_001"
]

var request = URLRequest(url: url)
request.httpMethod = "POST"
request.setValue("Bearer <token>", forHTTPHeaderField: "Authorization")
request.setValue("application/json", forHTTPHeaderField: "Content-Type")
request.httpBody = try? JSONSerialization.data(withJSONObject: payload)

let task = URLSession.shared.dataTask(with: request) { data, response, error in
    if let error = error {
        print("Error: \(error)")
        return
    }

    if let data = data, let responseString = String(data: data, encoding: .utf8) {
        print(responseString)
    }
}

task.resume()
```

```csharp C# theme={null}
using System;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;

class Program
{
    static async Task Main(string[] args)
    {
        var url = "https://aireiter.com/api/openapi/submit";

        var payload = @"
              {
                  ""model"": ""flux_3_klein"",
                  ""params"": {
                      ""prompt"": ""一辆未来感电动跑车停在现代玻璃建筑前，蓝调时刻，潮湿地面反射建筑灯光，商业汽车摄影，真实材质与自然阴影，无文字，无水印"",
                      ""aspect_ratio"": ""16:9"",
                      ""resolution"": ""2K""
                  },
                  ""out_task_id"": ""flux_3_klein_task_001""
              }";

        using var client = new HttpClient();
        client.DefaultRequestHeaders.Add("Authorization", "Bearer <token>");

        var content = new StringContent(payload, Encoding.UTF8, "application/json");
        var response = await client.PostAsync(url, content);
        var result = await response.Content.ReadAsStringAsync();

        Console.WriteLine(result);
    }
}
```

```c C theme={null}
#include <stdio.h>
#include <curl/curl.h>

int main(void) {
    CURL *curl;
    CURLcode res;

    curl_global_init(CURL_GLOBAL_DEFAULT);
    curl = curl_easy_init();

    if(curl) {
        const char *url = "https://aireiter.com/api/openapi/submit";
        const char *payload = "{\"model\":\"flux_3_klein\",\"params\":{\"prompt\":\"一辆未来感电动跑车停在现代玻璃建筑前，蓝调时刻，潮湿地面反射建筑灯光，商业汽车摄影，真实材质与自然阴影，无文字，无水印\",\"aspect_ratio\":\"16:9\",\"resolution\":\"2K\"},\"out_task_id\":\"flux_3_klein_task_001\"}";

        struct curl_slist *headers = NULL;
        headers = curl_slist_append(headers, "Authorization: Bearer <token>");
        headers = curl_slist_append(headers, "Content-Type: application/json");

        curl_easy_setopt(curl, CURLOPT_URL, url);
        curl_easy_setopt(curl, CURLOPT_POSTFIELDS, payload);
        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);

        res = curl_easy_perform(curl);

        if(res != CURLE_OK) {
            fprintf(stderr, "curl_easy_perform() failed: %s\n",
                    curl_easy_strerror(res));
        }

        curl_slist_free_all(headers);
        curl_easy_cleanup(curl);
    }

    curl_global_cleanup();
    return 0;
}
```

```objectivec Objective-C theme={null}
#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        NSURL *url = [NSURL URLWithString:@"https://aireiter.com/api/openapi/submit"];

        NSDictionary *payload = @{
            @"model": @"flux_3_klein",
            @"params": @{
                @"prompt": @"一辆未来感电动跑车停在现代玻璃建筑前，蓝调时刻，潮湿地面反射建筑灯光，商业汽车摄影，真实材质与自然阴影，无文字，无水印",
                @"aspect_ratio": @"16:9",
                @"resolution": @"2K"
            },
            @"out_task_id": @"flux_3_klein_task_001"
        };

        NSError *error;
        NSData *jsonData = [NSJSONSerialization dataWithJSONObject:payload
                                                          options:0
                                                            error:&error];

        NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
        [request setHTTPMethod:@"POST"];
        [request setValue:@"Bearer <token>" forHTTPHeaderField:@"Authorization"];
        [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
        [request setHTTPBody:jsonData];

        NSURLSessionDataTask *task = [[NSURLSession sharedSession]
            dataTaskWithRequest:request
            completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
                if (error) {
                    NSLog(@"Error: %@", error);
                    return;
                }
                NSString *result = [[NSString alloc] initWithData:data
                                                        encoding:NSUTF8StringEncoding];
                NSLog(@"%@", result);
            }];

        [task resume];
        [[NSRunLoop mainRunLoop] run];
    }
    return 0;
}
```

```ocaml OCaml theme={null}
(* Requires cohttp and yojson libraries *)
open Lwt
open Cohttp
open Cohttp_lwt_unix

let url = "https://aireiter.com/api/openapi/submit"

let payload = {|{
  "model": "flux_3_klein",
  "params": {
    "prompt": "一辆未来感电动跑车停在现代玻璃建筑前，蓝调时刻，潮湿地面反射建筑灯光，商业汽车摄影，真实材质与自然阴影，无文字，无水印",
    "aspect_ratio": "16:9",
    "resolution": "2K"
  },
  "out_task_id": "flux_3_klein_task_001"
}|}

let () =
  let headers = Header.init ()
    |> fun h -> Header.add h "Authorization" "Bearer <token>"
    |> fun h -> Header.add h "Content-Type" "application/json"
  in
  let body = Cohttp_lwt.Body.of_string payload in

  let response = Client.post ~headers ~body (Uri.of_string url) >>= fun (resp, body) ->
    body |> Cohttp_lwt.Body.to_string >|= fun body_str ->
    print_endline body_str
  in
  Lwt_main.run response
```

```dart Dart theme={null}
import 'dart:convert';
import 'package:http/http.dart' as http;

void main() async {
  final url = Uri.parse('https://aireiter.com/api/openapi/submit');

  final payload = {
        "model": "flux_3_klein",
        "params": {
            "prompt": "一辆未来感电动跑车停在现代玻璃建筑前，蓝调时刻，潮湿地面反射建筑灯光，商业汽车摄影，真实材质与自然阴影，无文字，无水印",
            "aspect_ratio": "16:9",
            "resolution": "2K"
        },
        "out_task_id": "flux_3_klein_task_001"
    };

  final response = await http.post(
    url,
    headers: {
      'Authorization': 'Bearer <token>',
      'Content-Type': 'application/json'
    },
    body: jsonEncode(payload),
  );

  print(response.body);
}
```

```r R theme={null}
library(httr)
library(jsonlite)

url <- "https://aireiter.com/api/openapi/submit"

payload <- list(
  model = "flux_3_klein",
  params = list(
    prompt = "一辆未来感电动跑车停在现代玻璃建筑前，蓝调时刻，潮湿地面反射建筑灯光，商业汽车摄影，真实材质与自然阴影，无文字，无水印",
    aspect_ratio = "16:9",
    resolution = "2K"
  ),
  out_task_id = "flux_3_klein_task_001"
)

response <- POST(
  url,
  add_headers(
    Authorization = "Bearer <token>",
    `Content-Type` = "application/json"
  ),
  body = toJSON(payload, auto_unbox = TRUE),
  encode = "raw"
)

cat(content(response, "text"))
```

```json 200 theme={null}
{
  "statusCode": 200,
  "message": "",
  "data": {
    "task_id": "",
    "status": "pending",
    "created_at": "2026-07-22T10:37:44.800Z",
    "out_task_id": "flux_3_klein_task_001"
  },
  "ok": true
}
```

```json 400 theme={null}
{
  "statusCode": 400,
  "message": "Invalid aspect_ratio: \"widescreen\". Allowed: [1:1, 5:4, 4:5, 4:3, 3:4, 16:9, 9:16]",
  "ok": false
}
```

```json 401 theme={null}
{
  "error": {
    "code": 401,
    "message": "身份验证失败，请检查您的API密钥"
  }
}
```

```json 500 theme={null}
{
  "error": {
    "code": 500,
    "message": "服务器内部错误，请稍后重试"
  }
}
```


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