Google: Gemini 3.1 Flash Image (Nano Banana 2)

google-ai.image-gen.gemini-3-1-flash-image

Generate or edit one image with Gemini 3.1 Flash Image at 512px, 1K, 2K or 4K on Google's own API, from a prompt and optional reference images; the image returns inline as base64.

Price: $0.165/successプロバイダー原価
Success rate: 99.2%Last 30 days · 1,058 calls
Latency p50: 11 sp95 23 s
Last verified: 2026/09/30Verified working

POSThttps://toolswitch.dev/v1/tools/google-ai.image-gen.gemini-3-1-flash-image?fields=candidates%28content%28parts%28text%2CinlineData%29%29%2CfinishReason%29%2CusageMetadata%2CmodelVersion%2CresponseId%2CpromptFeedback

Preview

Try online近日公開Provider docs ↗

Uses platform quota
Synchronous response
Reads public data

パラメータ

パラメータ	型	必須	説明	例
パスパラメータ
`model`	文字列	必須	gemini-3.1-flash-image is the stable model; the -preview alias is the same model at the same price.	`gemini-3.1-flash-image`
クエリパラメータ
`fields`	文字列	任意	Google's partial-response mask; the example drops the multi-megabyte thoughtSignature. Keep usageMetadata in any mask you send.	`candidates(content(parts(text,inlineData)),finishReason),usageMetadata,modelVersion,responseId,promptFeedback`

パスパラメータ
model文字列必須
gemini-3.1-flash-image is the stable model; the -preview alias is the same model at the same price.
例：gemini-3.1-flash-image
クエリパラメータ
fields文字列任意
Google's partial-response mask; the example drops the multi-megabyte thoughtSignature. Keep usageMetadata in any mask you send.
例：candidates(content(parts(text,inlineData)),finishReason),usageMetadata,modelVersion,responseId,promptFeedback

コード例

$TOOLSWITCH_KEY をコンソールで作成したキーに置き換えてください。

Preview

curl -X POST 'https://toolswitch.dev/v1/tools/google-ai.image-gen.gemini-3-1-flash-image?fields=candidates%28content%28parts%28text%2CinlineData%29%29%2CfinishReason%29%2CusageMetadata%2CmodelVersion%2CresponseId%2CpromptFeedback' \
  -H "X-Toolswitch-Key: $TOOLSWITCH_KEY" \
  -H "Content-Type: application/json" \
  --data-raw '{"contents":[{"parts":[{"text":"A clean editorial illustration of a paper airplane."}]}],"generationConfig":{"imageConfig":{"imageSize":"1K","aspectRatio":"1:1"},"responseModalities":["IMAGE"]}}'

import os
import json
import requests

response = requests.request(
    "POST",
    "https://toolswitch.dev/v1/tools/google-ai.image-gen.gemini-3-1-flash-image?fields=candidates%28content%28parts%28text%2CinlineData%29%29%2CfinishReason%29%2CusageMetadata%2CmodelVersion%2CresponseId%2CpromptFeedback",
    headers={"X-Toolswitch-Key": os.environ["TOOLSWITCH_KEY"]},
    json=json.loads("{\"contents\":[{\"parts\":[{\"text\":\"A clean editorial illustration of a paper airplane.\"}]}],\"generationConfig\":{\"imageConfig\":{\"imageSize\":\"1K\",\"aspectRatio\":\"1:1\"},\"responseModalities\":[\"IMAGE\"]}}"),
)
response.raise_for_status()
print(response.text)

const response = await fetch("https://toolswitch.dev/v1/tools/google-ai.image-gen.gemini-3-1-flash-image?fields=candidates%28content%28parts%28text%2CinlineData%29%29%2CfinishReason%29%2CusageMetadata%2CmodelVersion%2CresponseId%2CpromptFeedback", {
  method: "POST",
  headers: {
    "X-Toolswitch-Key": process.env.TOOLSWITCH_KEY ?? "",
    "Content-Type": "application/json",
  },
  body: JSON.stringify(JSON.parse("{\"contents\":[{\"parts\":[{\"text\":\"A clean editorial illustration of a paper airplane.\"}]}],\"generationConfig\":{\"imageConfig\":{\"imageSize\":\"1K\",\"aspectRatio\":\"1:1\"},\"responseModalities\":[\"IMAGE\"]}}")),
});
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
console.log(await response.text());

このゲートウェイ API はプレビュー版です。URL や認証方式は変更される場合があります。パラメータはサンプルデータです。呼び出し料金は $0.165/success です。サービス料を含みます。