The file in question is called “weights.bin,” which powers Google’s on-device Gemini Nano AI model – the engine behind Chrome features like scam detection, autofill suggestions, and the “Help Me Write” tool. Local models tend to be pretty big storage-wise, and this one is no different. The problem is that Google hasn’t clearly signposted the fact that it’s eating 4GB of your drive with training data.
The issue only recently came to light thanks to security researcher Alexander Hanff, who noticed that Chrome installs the model on any device meeting the minimum hardware requirements, only without prompting you whether you’d like it there in the first place.
I was opted into the On-device AI feature but for some reason did not have the file on my Mac.
Artificial Intelligence Google Chrome Mac Mac App macOS Tahoe 26 Storage
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