Gemini 3.1 Flash Image API - RouterBase

Overview

Gemini 3.1 Flash Image is Google’s low-latency image model, available on RouterBase. It supports text-to-image with configurable aspect ratio and resolution (up to 4K), plus natural-language image editing with up to 14 reference images.


Provider	Google
Family	`gemini-3-1-flash-image`
Modality	Image
Supported tasks	`text-to-image`, `edit`

Endpoint

POST https://routerbase.com/v1/images/generations

Playground

Try it live without writing code:

Supported Tasks

Each task has its own reference page with full parameter docs and examples:

Authentication

All requests require a Bearer token — create one at routerbase.com/api-key.

curl https://routerbase.com/v1/images/generations \
  -H "Authorization: Bearer $ROUTERBASE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "google/gemini-3-1-flash-image-t2i", "prompt": "…"}'