Chrome Silently Downloaded 4GB AI Model: Check Settings Now

Chrome Silently Downloaded 4GB AI Model

I had 10GB free yesterday, and this morning only 6GB left. I searched forever before finding out Chrome silently installed it.

For those of us running solo projects, computer storage is always tight. Client files, design assets, screen recordings—everything eats up space. Last month, I was revising a proposal at a WeWork in Hangzhou, and my disk suddenly went red. I deleted temp files for ages to free up 2GB. The next day, it was full again. I wasted a whole afternoon figuring it out—Chrome was silently downloading a 4GB AI model in the background. No asking, no prompt.

What is it? Who already got it

This thing is called Gemini Nano, Google's local AI model. Starting from Chrome version 127, a feature called "Preload pages" or "Optimization Guide" is enabled by default, which is actually installing AI on your machine. Zhao Wei, a freelancer, was venting to me last week—she was rushing a video editing gig at a Starbucks, and the render failed halfway due to insufficient disk space. Turned out this model took up 4GB. Google says it's so we can use AI features offline, but most of us never even use this.

Cost to replicate today

Money: $0. Time: 5 minutes. Technical barrier: Just knowing how to open browser settings. First step: Click the three dots on the top right of Chrome.

How to turn it off: 1) Open Chrome, type chrome://settings/privacy in the address bar; 2) Find the "Preload pages" or "Optimization Guide" option and turn it off; 3) Type chrome://components/, find the "Optimization Guide" item, and click delete; 4) To completely delete the downloaded model, go to this path on your computer and delete the folder (Windows users: C:\Users\YourUsername\AppData\Local\Google\Chrome\User Data\OptimizationGuide, Mac users: ~/Library/Application Support/Google/Chrome/OptimizationGuide).

Advice by stage

If you're just starting out, only have one computer, and storage is precious, I'd suggest spending 5 minutes today to turn it off—that 4GB can hold a lot of client files. If you have 1-2 clients and use Chrome daily but never use offline AI features, turning it off won't affect your work at all. If you're scaling up and your team uses Chrome, add these opt-out steps to your team onboarding docs so everyone doesn't lose 4GB.

Not everyone needs to turn this off—if you're actually using Chrome's AI writing assistant or similar features, keep it. It's fine if you don't do it right now; just remember to check next time your computer storage throws an alert.