Google AI (Gemini API)Image GenerationAI generation

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/successAt provider cost
Success rate: 99.2%Last 30 days · 1,058 calls
Latency p50: 11 sp95 23 s
Last verified: Sep 30, 2026Verified 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 onlineProvider docs ↗

Uses platform quota
Synchronous response
Reads public data

Parameters

Parameter	Type	Required	Description	Example
Path parameters
`model`	string	Required	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`
Query parameters
`fields`	string	Optional	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`

Path parameters
modelstringRequired
gemini-3.1-flash-image is the stable model; the -preview alias is the same model at the same price.
Example: gemini-3.1-flash-image
Query parameters
fieldsstringOptional
Google's partial-response mask; the example drops the multi-megabyte thoughtSignature. Keep usageMetadata in any mask you send.
Example: candidates(content(parts(text,inlineData)),finishReason),usageMetadata,modelVersion,responseId,promptFeedback

Code samples

Replace $TOOLSWITCH_KEY with the key you created in the console.

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());

This gateway API is in preview; its URL and authentication may change. The example parameters are sample data. Calls are billed at $0.165/success, including the service fee.