Nano Banana Lite Image Generation

Supports 1K resolution only (passing 2K/4K/0.5K is automatically downgraded to 1K without an error)
Supports text-to-image and image-to-image, up to 14 reference images
Billed by input / output tokens; connects directly to the official Gemini channel, with asynchronous task-based image generation

Info

Model-name compatibility note: gemini-3.1-flash-lite-image also accepts the alias nano-banana-2-lite, and gemini-3.1-flash-lite-image-ext also accepts the alias nano-banana-2-lite-ext; each name and its alias are equivalent and interchangeable.

Request example

# model can be "gemini-3.1-flash-lite-image", the alias "nano-banana-2-lite" also works
curl --request POST \
  --url https://api.openveer.com/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://api.openveer.com/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://api.openveer.com/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://api.openveer.com/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://api.openveer.com/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://api.openveer.com/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://api.openveer.com/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://api.openveer.com/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://api.openveer.com/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://api.openveer.com/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://api.openveer.com/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://api.openveer.com/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://api.openveer.com/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://api.openveer.com/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"))

Response example

{
  "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

Authorization string

All API endpoints require Bearer Token authentication

Get your API Key:

Visit the API Key Management Page to get your API Key

Add it to the request header:

Authorization: Bearer YOUR_API_KEY

Body

model string

Image generation model name

The following model names are supported:

gemini-3.1-flash-lite-image (Nano Banana Lite, compatible alias nano-banana-2-lite)
gemini-3.1-flash-lite-image-ext (compatible alias nano-banana-2-lite-ext)

Note

Both share the same parameters and constraints (1K only, google_search / official_fallback not supported, up to 14 reference images). Neither has a -official variant, and neither supports the official_fallback fallback parameter. Billing is subject to the backend configuration of each channel.

The aliases `nano-banana-2-lite` (for `gemini-3.1-flash-lite-image`) and `nano-banana-2-lite-ext` (for `gemini-3.1-flash-lite-image-ext`) are equivalent to their original names and interchangeable.

nsfw_check boolean

Whether to run content moderation before submitting the image task.

true: use omni-moderation-latest to review prompts and input images
false or omitted: do not send a moderation request, adding no moderation cost or latency (default)

prompt string

Text description for image generation

size string

Image aspect ratio

Supported ratios:

auto - Automatically choose the aspect ratio
1:1 - Square, avatars, social media
3:2 / 2:3 - Standard photos
4:3 / 3:4 - Traditional display ratio
16:9 / 9:16 - Widescreen / vertical video covers
5:4 / 4:5 - Instagram images
21:9 - Ultra-wide banner

Warning

For text-to-image, when size is auto, the default is 1:1 or 16:9; for image-to-image, the aspect ratio follows the upstream response. (We recommend specifying an aspect ratio.)

resolution string

Output image resolution

Supported values:

1K - \~1024px, standard resolution (the only tier Lite supports)

Warning

Lite only supports 1K. Passing 2K / 4K / 0.5K is silently downgraded to 1K — it won't raise an error, nor will it actually output higher resolution. The frontend UI does not need to expose a resolution option.

n integer

Number of images to generate

Range: 1 to 4, default 1

When n>1, the backend sends multiple concurrent requests upstream and bills by the actual number of successful images. We recommend the frontend always send 1 (to show progress image by image and make billing more intuitive).

⚠️ Note: Must enter a plain number (e.g., 1), do not use quotes or it will cause an error

image_urls array

Reference image URL list for image-to-image generation

Two formats are supported:

1. Full image URL

Publicly accessible image URL (http\:// or https\://)
Example: https://example.com/image.jpg

2. Base64 encoded format

Must use the full Data URI format
Format: data:image/{format};base64,{base64data}
Supported image formats: jpeg, png, webp
Example: data:image/jpeg;base64,/9j/4AAQSkZJRgABAQEAYABg...
⚠️ Note: Must include the data:image/jpeg;base64, prefix

Limitations:

Maximum 14 reference images (recommended: up to 10 object refs + 4 character refs)
Single image size: not exceeding 10MB
Supported formats: jpeg, png, webp

webhook string

Task callback URL (base)

When a task succeeds / fails, the platform calls back to webhook + /callback (it does not forward the upstream request). Passing this parameter can significantly reduce polling; we still recommend keeping polling as a fallback.

Note

Lite usage notes

google_search / google_image_search are not supported: Lite uses the Developer API's interactions endpoint, and the upstream has not enabled the Search tool (it returns "Search as tool is not enabled for this model"), so the platform adapter does not send this parameter either. Passing it won't raise an error and images are generated as usual, but there is no search enhancement effect at all. If you need search enhancement, switch to gemini-3.1-flash-image-preview.
mask_url inpainting is not supported (the Gemini family uses aspect ratio + reference images rather than masks).
Billed by token (unlike the fixed per-image price of flash/pro): input is about $0.25 per million tokens, image output is about $30 per million tokens, and a single 1K image ≈ 1120 output tokens ≈ \$0.0336/image. The actual price is subject to the backend multiplier configuration.
All generated images contain Google's SynthID invisible watermark (upstream behavior, cannot be disabled).

Response

code integer

Response status code

data array

Response data array

status string

Task status

  * submitted - Submitted

task_id string

Unique task identifier

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