Is the Gemini API free?

Google AI Studio offers a free tier for testing; production usage is billed per token.

Flash or Pro — which tier should I use?

Default to Flash: it is fast, cheap, and strong enough for most extraction, chat, and summarization work. Reserve Pro for the calls where deep reasoning or tricky multimodal analysis measurably beats Flash — mixing tiers per endpoint is normal practice.

How do I get a Gemini API key?

Create a key in Google AI Studio, then call the API with it in a header. For production, move to Vertex AI and use service-account credentials, which add enterprise security, quotas, and region controls.

APIIntermediate

Google Gemini API Documentation

Name: Google Gemini API Documentation
Author: Google

The official documentation for Google's Gemini API, covering text, image, audio, and video understanding in a unified multimodal interface. It includes guides on authentication, function calling, context caching, and code execution, with a generous free tier for experimentation. Aimed at developers building applications that need to process multiple content types within a single request.

Overview

"Google Gemini API Documentation" is a "API" resource curated by AI Resource Hub, filed under the AI APIs category and suited to Intermediate-level learners. It is provided by Google, was last updated on 2026-06-24, and holds an editorial score of 4.5/5 from our team. Click "Visit Resource" on the right to open the original page.

Our Verdict

This documentation is your map to what is arguably the most naturally multimodal mainstream model family: text, images, audio, and video in one call, with context windows that swallow entire codebases. AI Studio’s generous free tier makes it the cheapest place to prototype serious ideas, and the Flash/Pro split lets you trade speed against depth per endpoint. The honest friction: model names and tiers churn relentlessly, behavior shifts between tiers, and some features stay region-locked. For production, graduate to Vertex AI. As a multimodal starting point, nothing else is this accessible.

Key Features

▹Natively multimodal: text, images, audio, and video
▹Very long context windows
▹Flash and Pro tiers to balance speed and cost

Pros

+Strong multimodal understanding
+Generous free tier for prototyping
+Generous free tier makes it cheap to prototype

Cons

−Behavior can differ across model tiers
−Model names and tiers change frequently
−Some features are region-restricted

FAQ

Visit Resource →

Details

Pricing: Free tier via AI Studio; usage-based paid API
Author: Google
Editorial score: ★ 4.5 / 5
Last updated: Jun 24, 2026