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Nano Banana Lite 图像生成

  • Gemini 3.1 系列中最快、最便宜的图像模型，主打规模化、低成本出图
  • 仅支持 1K 分辨率（传 2K/4K/0.5K 会自动降级为 1K，不报错）
  • 支持文生图、图生图，最多 14 张参考图
  • 按 input / output token 计费；直连官方 Gemini 渠道，异步任务出图

模型名兼容提示：gemini-3.1-flash-lite-image 兼容别名 nano-banana-2-lite，gemini-3.1-flash-lite-image-ext 兼容别名 nano-banana-2-lite-ext，各名称与其别名等价、可互换使用。

请求示例
# model 可填 "gemini-3.1-flash-lite-image"，也兼容别名 "nano-banana-2-lite"
curl --request POST \
  --url https://26j.cn/v1/images/generations \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
    "model": "gemini-3.1-flash-lite-image",
    "prompt": "赛博朋克风格的城市夜景，霓虹灯闪烁",
    "size": "16:9",
    "resolution": "1K",
    "n": 1
  }'

import requests

url = "https://26j.cn/v1/images/generations"

payload = {
    "model": "gemini-3.1-flash-lite-image",
    "prompt": "赛博朋克风格的城市夜景，霓虹灯闪烁",
    "size": "16:9",
    "resolution": "1K",
    "n": 1
}

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

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

print(response.json())

const url = "https://26j.cn/v1/images/generations";

const payload = {
  model: "gemini-3.1-flash-lite-image",
  prompt: "赛博朋克风格的城市夜景，霓虹灯闪烁",
  size: "16:9",
  resolution: "1K",
  n: 1
};

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

fetch(url, {
  method: "POST",
  headers: headers,
  body: JSON.stringify(payload)
})
  .then(response => response.json())
  .then(data => console.log(data))
  .catch(error => console.error('Error:', error));

package main

import (
    "bytes"
    "encoding/json"
    "fmt"
    "io/ioutil"
    "net/http"
)

func main() {
    url := "https://26j.cn/v1/images/generations"

    payload := map[string]interface{}{
        "model":      "gemini-3.1-flash-lite-image",
        "prompt":     "赛博朋克风格的城市夜景，霓虹灯闪烁",
        "size":       "16:9",
        "resolution": "1K",
        "n":          1,
    }

    jsonData, _ := json.Marshal(payload)

    req, _ := http.NewRequest("POST", url, bytes.NewBuffer(jsonData))
    req.Header.Set("Authorization", "Bearer <token>")
    req.Header.Set("Content-Type", "application/json")

    client := &http.Client{}
    resp, err := client.Do(req)
    if err != nil {
        panic(err)
    }
    defer resp.Body.Close()

    body, _ := ioutil.ReadAll(resp.Body)
    fmt.Println(string(body))
}

import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.net.URI;

public class Main {
    public static void main(String[] args) throws Exception {
        String url = "https://26j.cn/v1/images/generations";

        String payload = """
        {
          "model": "gemini-3.1-flash-lite-image",
          "prompt": "赛博朋克风格的城市夜景，霓虹灯闪烁",
          "size": "16:9",
          "resolution": "1K",
          "n": 1
        }
        """;

        HttpClient client = HttpClient.newHttpClient();
        HttpRequest request = HttpRequest.newBuilder()
            .uri(URI.create(url))
            .header("Authorization", "Bearer <token>")
            .header("Content-Type", "application/json")
            .POST(HttpRequest.BodyPublishers.ofString(payload))
            .build();

        HttpResponse<String> response = client.send(request,
            HttpResponse.BodyHandlers.ofString());

        System.out.println(response.body());
    }
}

<?php

$url = "https://26j.cn/v1/images/generations";

$payload = [
    "model" => "gemini-3.1-flash-lite-image",
    "prompt" => "赛博朋克风格的城市夜景，霓虹灯闪烁",
    "size" => "16:9",
    "resolution" => "1K",
    "n" => 1
];

$ch = curl_init($url);
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"
]);

$response = curl_exec($ch);
curl_close($ch);

echo $response;
?>

require 'net/http'
require 'json'
require 'uri'

url = URI("https://26j.cn/v1/images/generations")

payload = {
  model: "gemini-3.1-flash-lite-image",
  prompt: "赛博朋克风格的城市夜景，霓虹灯闪烁",
  size: "16:9",
  resolution: "1K",
  n: 1
}

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

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

import Foundation

let url = URL(string: "https://26j.cn/v1/images/generations")!

let payload: [String: Any] = [
    "model": "gemini-3.1-flash-lite-image",
    "prompt": "赛博朋克风格的城市夜景，霓虹灯闪烁",
    "size": "16:9",
    "resolution": "1K",
    "n": 1
]

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()

using System;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;

class Program
{
    static async Task Main(string[] args)
    {
        var url = "https://26j.cn/v1/images/generations";

        var payload = @"{
            ""model"": ""gemini-3.1-flash-lite-image"",
            ""prompt"": ""赛博朋克风格的城市夜景，霓虹灯闪烁"",
            ""size"": ""16:9"",
            ""resolution"": ""1K"",
            ""n"": 1
        }";

        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);
    }
}

#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://26j.cn/v1/images/generations";
        const char *payload = "{"
            "\"model\":\"gemini-3.1-flash-lite-image\","
            "\"prompt\":\"赛博朋克风格的城市夜景，霓虹灯闪烁\","
            "\"size\":\"16:9\","
            "\"resolution\":\"1K\","
            "\"n\":1"
        "}";

        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;
}

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        NSURL *url = [NSURL URLWithString:@"https://26j.cn/v1/images/generations"];

        NSDictionary *payload = @{
            @"model": @"gemini-3.1-flash-lite-image",
            @"prompt": @"赛博朋克风格的城市夜景，霓虹灯闪烁",
            @"size": @"16:9",
            @"resolution": @"1K",
            @"n": @1
        };

        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;
}

(* Requires cohttp and yojson libraries *)
open Lwt
open Cohttp
open Cohttp_lwt_unix

let url = "https://26j.cn/v1/images/generations"

let payload = {|{
  "model": "gemini-3.1-flash-lite-image",
  "prompt": "赛博朋克风格的城市夜景，霓虹灯闪烁",
  "size": "16:9",
  "resolution": "1K",
  "n": 1
}|}

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

import 'dart:convert';
import 'package:http/http.dart' as http;

void main() async {
  final url = Uri.parse('https://26j.cn/v1/images/generations');

  final payload = {
    'model': 'gemini-3.1-flash-lite-image',
    'prompt': '赛博朋克风格的城市夜景，霓虹灯闪烁',
    'size': '16:9',
    'resolution': '1K',
    'n': 1
  };

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

  print(response.body);
}

library(httr)
library(jsonlite)

url <- "https://26j.cn/v1/images/generations"

payload <- list(
  model = "gemini-3.1-flash-lite-image",
  prompt = "赛博朋克风格的城市夜景，霓虹灯闪烁",
  size = "16:9",
  resolution = "1K",
  n = 1
)

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

cat(content(response, "text"))
响应示例
{
  "code": 200,
  "data": [
    {
      "status": "submitted",
      "task_id": "task_01K8SGYNNNVBQTXNR4MM964S7K"
    }
  ]
}

{
  "error": {
    "code": 400,
    "message": "请求参数无效",
    "type": "invalid_request_error"
  }
}

{
  "error": {
    "code": 401,
    "message": "身份验证失败，请检查您的API密钥",
    "type": "authentication_error"
  }
}

{
  "error": {
    "code": 402,
    "message": "账户余额不足，请充值后再试",
    "type": "payment_required"
  }
}

{
  "error": {
    "code": 403,
    "message": "访问被禁止，您没有权限访问此资源",
    "type": "permission_error"
  }
}

{
  "error": {
    "code": 429,
    "message": "请求过于频繁，请稍后再试",
    "type": "rate_limit_error"
  }
}

{
  "error": {
    "code": 500,
    "message": "服务器内部错误，请稍后重试",
    "type": "server_error"
  }
}

{
  "error": {
    "code": 502,
    "message": "网关错误，服务器暂时不可用",
    "type": "bad_gateway"
  }
}

Authorizations

Authorizationstring必填

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 获取您的 API Key

使用时在请求头中添加：

Authorization: Bearer YOUR_API_KEY

Body

modelstring必填默认 gemini-3.1-flash-lite-image

图像生成模型名称

支持以下模型名：

  • gemini-3.1-flash-lite-image（Nano Banana Lite，兼容别名 nano-banana-2-lite）
  • gemini-3.1-flash-lite-image-ext（兼容别名 nano-banana-2-lite-ext）

两者参数与约束相同（仅 1K、不支持 google_search / official_fallback、最多 14 张参考图）。均无 -official 变体，也不支持 official_fallback 兜底参数。计费以各自渠道的后台配置为准。

别名 nano-banana-2-lite（对应 gemini-3.1-flash-lite-image）、nano-banana-2-lite-ext（对应 gemini-3.1-flash-lite-image-ext）与各自的原名等价，可互换使用。

nsfw_checkboolean默认 false

是否在提交图片任务前执行内容审核。

  • true：使用 omni-moderation-latest 审核提示词和输入图片
  • false 或不传：不发起审核请求，不增加审核成本与延迟（默认）
promptstring必填

图像生成的文本描述

sizestring

图像生成的宽高比

支持的比例：

  • auto - 自动选择宽高比
  • 1:1 - 方形图、头像、社交媒体
  • 3:2 / 2:3 - 标准照片
  • 4:3 / 3:4 - 传统显示器比例
  • 16:9 / 9:16 - 宽屏/竖屏视频封面
  • 5:4 / 4:5 - Instagram 图片
  • 21:9 - 超宽屏 Banner

文生图 size 为 auto 时默认 1:1 或 16:9；图生图按上游返回比例为准。（建议指定比例）

resolutionstring默认 1K

输出图像分辨率

支持的值：

  • 1K - 约 1024px，标准分辨率（Lite 仅支持此档）

Lite 只支持 1K。传 2K / 4K / 0.5K 会被静默降级为 1K，不会报错，也不会真正输出高分辨率。前端 UI 无需暴露分辨率选项。

ninteger默认 1

生成图像的数量

取值范围：1 \~ 4，默认 1

n>1 时后端会并发多次请求上游，按实际成功张数计费。建议前端固定传 1（逐张展示进度、计费更直观）。

⚠️ 注意： 必须输入纯数字（如 1），不要加引号，否则会报错

image_urlsarray

参考图像的 URL 列表，用于图生图

支持两种格式：

1. 完整的图像URL地址

  • 公开可访问的图像URL（http\:// 或 https\://）
  • 示例：https://example.com/image.jpg

2. Base64 编码格式

  • 必须使用完整的 Data URI 格式
  • 格式：data:image/{格式};base64,{base64数据}
  • 支持的图片格式：jpeg、png、webp
  • 示例：data:image/jpeg;base64,/9j/4AAQSkZJRgABAQEAYABg...
  • ⚠️ 注意：必须包含 data:image/jpeg;base64, 前缀部分

限制：

  • 最多 14 张参考图（建议：最多 10 张物体参考 + 4 张角色参考）
  • 单张图片不超过 10MB
  • 支持格式：jpeg、png、webp
webhookstring

任务回调地址（base）

任务成功 / 失败时，本平台会回调 webhook + /callback（不转发上游）。传此参数可显著减少轮询；仍建议保留轮询作兜底。

Lite 使用要点

  • 不支持 google_search / google_image_search：Lite 走 Developer API 的 interactions 端点，上游未开放 Search 工具（会返回 "Search as tool is not enabled for this model"），平台适配器也不下发该参数。传了不会报错、照常出图，但无任何搜索增强效果。需要搜索增强请改用 gemini-3.1-flash-image-preview。
  • 不支持 mask_url 局部重绘（Gemini 系列走 aspect ratio + 参考图，不走蒙版）。
  • 按 token 计费（区别于 flash/pro 的按张固定价）：输入约 $0.25/百万 token、图片输出约 $30/百万 token，1K 单张 ≈ 1120 output token ≈ \$0.0336/张。实际价格以后台倍率配置为准。
  • 所有生成图片含 Google SynthID 隐形水印（上游行为，无法关闭）。

Response

codeinteger

响应状态码

dataarray

返回数据数组

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