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Steps to Obtain a Gemini API Key (Paid Version)

yuki-P

This article summarizes the steps to obtain a Gemini API key.
In particular, I would like to leave information targeting the paid version.

While the Gemini API has a free tier, the reasons for choosing the paid version include:

  • The possibility of responses stopping midway due to rate limits, etc.

  • Patterns where some features cannot be used (such as new features)

  • The Gemini API is relatively inexpensive even when paid ( pricing page )

and various other reasons.
If you want to use it stress-free without worrying about limits, even if it incurs some costs, the paid version is recommended.

*Last updated: 2025/10/17


1. Create an API key in Google AI Studio

Navigate to the Google AI Studio API page.

Click "Create API key" in the top right
Enter a key name (anything is fine)
Select a project

*If you already have a GCP project, select "Import project"; if not, create a new one using "Create project".
This time, we will follow the flow of creating a new one.

Enter a project name and create the project
Create the key after the project is created
This completes the creation of the API key (free tier)
You can copy the key string to the clipboard

2. Configure in Google Cloud (paid tier)

Access the GCP page from the "Set up billing information" link
Agree to the terms and continue
Enter the required information and proceed
Click "Activate full account" on the GCP home screen
Your full account has been enabled.

You should now be able to use the Gemini API under the paid plan.
Any API costs incurred will be charged to the registered credit card.

Once you are on the paid plan, your quota tier will become Tier 1.

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