Nano Banana (Gemini 2.5 Flash Image) API

Overview

Nano Banana (Gemini 2.5 Flash Image) is the original, cost-optimised tier of Google’s Nano Banana image family, available on RouterBase. It delivers high-quality images with strong prompt fidelity at a flat per-image price — ideal for high-volume workloads, quick iteration, and batch generation. For the flagship tier see Nano Banana Pro; for the low-latency successor see Gemini 3.1 Flash Image (Nano Banana 2).


Provider	Google
Family	`gemini-2-5-flash-image`
Modality	Image
Supported tasks	`text-to-image`, `edit`
Price	$0.037 per image (flat)

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-2-5-flash-image-t2i", "prompt": "…"}'

Get Started

API Reference

Nano Banana (Gemini 2.5 Flash Image) API

Overview

Endpoint

Playground

Supported Tasks

Authentication

​Overview

​Endpoint

​Playground

​Supported Tasks

​Authentication

Overview

Endpoint

Playground

Supported Tasks

Authentication