Google Gemini API - RouterBase

Overview

Google’s Gemini models on RouterBase, served through the standard OpenAI-compatible chat completions endpoint (streaming, tool calling, vision, per-user prompt caching).


Provider	Google
Family	`gemini`
Modality	Chat
Caching	Per-user prompt cache (automatic, isolated)

Models

google/gemini-2.5-pro
google/gemini-2.5-flash
google/gemini-2.5-flash-lite
google/gemini-3-flash-preview
google/gemini-3.1-pro-preview
google/gemini-3.1-flash-lite

Pricing is deliberately not reproduced here. Rates are set per model in the RouterBase catalogue and can be overridden per account, so any figure copied into this page is a snapshot that goes stale the next time a rate changes. Fetch the current rate for any model from the Models API:

GET /api/models/{model}/pricing

URL-encode the slash in the model id — e.g. google%2Fgemini-2.5-pro.

Endpoint

POST https://routerbase.com/v1/chat/completions

Drop-in compatible with the OpenAI client — point it at https://routerbase.com/v1. See the full Chat Completions reference for every parameter, streaming, and prompt-caching details.

Quickstart

curl https://routerbase.com/v1/chat/completions \
  -H "Authorization: Bearer $ROUTERBASE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "google/gemini-2.5-pro",
    "messages": [{ "role": "user", "content": "Hello!" }]
  }'

Live catalogue + current rates: the Models API.