Getting a Gemini API Key
Google gives you a Gemini API key through Google AI Studio in a couple of minutes. Here's the exact path, the free-vs-paid trade-off most people miss, and a cheaper way to actually call Gemini in production.
Step by Step
- Go to aistudio.google.com and sign in with a Google account.
- Click "Get API key" (top-left menu).
- Choose Create API key — either in a new project or an existing Google Cloud project.
- Copy the key and store it somewhere safe (a secrets manager or
.env), never in client-side code or a public repo.
That's it — you can now call Gemini's REST endpoint with the key as a header.
Free Tier vs Paid Tier (Read This)
Google offers a free tier with rate limits that's great for testing. Two things to know:
- On the free tier, Google may use your prompts/responses to improve its products — so don't send sensitive or proprietary data.
- The paid tier (billing enabled in Google Cloud) removes that data-use, raises rate limits, and unlocks the newest models. As of April 2026, Gemini Pro tiers are paid-only.
If you're going to production, you'll enable billing — which means setting up Google Cloud, quotas, and a separate bill.
The Cheaper Way to Use Gemini
If your goal is to use Gemini in an app (not specifically to hold Google's key), there's a simpler path: call it through a gateway. With LinkModel, one key gives you Gemini plus Claude, GPT, DeepSeek and more — up to 30% below official rates, with the per-request price shown before each call and zero data retention by default (no free-tier data-use concern).
curl -X POST https://api.linkmodel.ai/v1/chat/completions \
-H "Authorization: Bearer $LINKMODEL_API_KEY" -H "Content-Type: application/json" \
-d '{ "model": "gemini-3.5-flash", "messages": [{"role":"user","content":"Summarize this doc: ..."}] }'No Google Cloud project, no per-provider billing setup, and you can switch to Claude or DeepSeek with a one-word change. Confirm the exact chat endpoint in the docs.
Which Gemini Model to Call
- Cheap, high-volume → Gemini 2.5 Flash-Lite / Flash
- Best value at quality → Gemini 3.5 Flash
- Hardest reasoning / 2M context → Gemini 3.1 Pro
Full pricing in the Gemini Pro guide and Gemini Flash guide.
Keep Your Key Safe
Whichever route you choose: never commit keys to Git, never ship them in a mobile app (proxy through your backend — see AI API for mobile apps), and rotate keys if exposed.
Bottom Line
Get a Gemini key in Google AI Studio for testing; for production, either enable Google Cloud billing or skip the setup and call Gemini (and every other model) through one cheaper key. Need OpenAI or Claude too? See how to get an API key.
Start free with a $1 credit — call Gemini in a minute.