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Google Just Turned Over 1 Billion Computers Into an AI Storage Dump

Victor Huber

2026-05-06

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Your computer may be one of them.

What happened?

Chrome has quietly downloaded a 4 GB artificial intelligence model onto users’ disks. The file is called weights.bin, and it contains the weights for the Gemini Nano model.

You can find it inside a folder named OptGuideOnDeviceModel in your Chrome profile.

Why this is a problem

You did not clearly authorize this. There is an option to block it, but it is hidden deep inside Chrome settings and experimental flags that most users will never check.

AI-related features are enabled by default, and if you delete the file manually, Chrome may download it again automatically.

In other words, you decide what should stay on your disk, but the browser may ignore that decision.

Where does this happen?

This behavior has been reported on Windows, macOS, and Ubuntu.

On macOS, forensic logs reportedly show the file being installed on April 24, 2026, mixed in with security updates. Some developers say this has been happening for more than a year.

The most confusing part

Chrome 147 adds an “AI Mode” button to the address bar.

When users see that button, they may assume that AI searches are being processed locally on their computer, especially if a 4 GB AI model is already stored on the disk.

But that is not what happens.

AI Mode runs in the cloud. Your queries are sent to Google’s servers. The 4 GB model on your computer is not used for that button.

So what is the local AI model used for?

The downloaded model is mainly used for features such as:

Help Me Write
scam detection

These are features hidden in menus, such as right-click options, that many users may never open.

The privacy concern

Google used several gigabytes of disk space without clear user consent to support features that many people do not actively use.

Meanwhile, the visible AI feature that users actually notice — AI Mode — sends data to the cloud instead of running locally.

In Europe, researchers have already pointed to a possible violation of Article 5(3) of the ePrivacy Directive, which requires consent before storing software or information on a user’s device.