A hidden Chrome behavior has raised fresh concern among users who watch storage space and data usage closely. On some eligible laptops and desktops, the browser has reportedly downloaded an AI model of about 4GB without a clear notice to the person using the device.
The issue matters because the file is stored locally and runs in the background. That means the download can happen without drawing much attention, even though it may affect disk capacity, internet consumption, and, for some users, access costs.
Security researcher Alexander Hanff said Chrome first checks whether a device meets certain hardware requirements before triggering the automatic download. He linked the file to Google’s Gemini Nano system, which supports on-device AI features such as writing assistance and other browser functions that rely on local processing.
Hanff said the core problem is not only the size of the file, but also the lack of clear transparency. Users may not be told in a straightforward way that a multi-gigabyte AI model is being placed directly on their computer.
In his macOS test, Hanff created a new Chrome profile and monitored file activity. He found that Chrome created a folder named OptGuideOnDeviceModel and downloaded the full payload of about 4GB without direct user interaction.
The download reportedly took a little more than 14 minutes. Hanff also said Chrome evaluated the machine’s hardware capabilities before the transfer began, reinforcing the idea that the process was tied to device compatibility checks.
Where to look on the device
For users who want to verify whether the file is present, a specific Windows 11 path has been identified. The directory to inspect is %LOCALAPPDATA%\Google\Chrome\User Data, where the folder named OptGuideOnDeviceModel may appear.
Finding that folder is treated as one sign that the AI model has already been downloaded. The check becomes especially relevant when storage space drops unexpectedly or data usage rises without a clear explanation.
Deleting the file may not be enough to stop it from coming back. Hanff said Chrome can download the AI model again later if certain settings remain enabled.
What users can try
One possible step is to disable the experimental flag tied to “Optimization Guide On Device” on the chrome://flags page. That approach has been reported to help prevent related features from triggering another AI model download on some systems.
Even so, some reports indicate that removing Chrome entirely may be the only way to fully ensure the file does not return. That leaves limited practical options for users who want to keep using the browser while avoiding the background component.
The situation also raises broader questions about control and privacy. When a large AI component is installed quietly in the background, users may not know what was stored, when it arrived, or which features depend on it.
Hanff also pointed to the possible scale of the data burden. If hundreds of millions of Chrome users received a similar 4GB download, the total traffic could reach petabyte or even exabyte levels.
That scale would not only affect networks and infrastructure, but also energy use and carbon emissions. It could also hit harder for people on limited or expensive internet plans, since a background download of that size may directly increase access costs.
The concern follows Hanff’s earlier criticism of a different AI app installation approach. In another case, he accused Anthropic’s Claude Desktop of quietly installing browser integration components in some Chromium-based browsers and even reinstalling them after removal.
As of the report, Google had not issued a detailed public response to the allegation. Users worried about storage, data usage, or background AI downloads are being advised to check for the related folder, review Chrome’s experimental AI settings, and watch future browser updates closely.
Source: www.indiatoday.in
