Chrome’s Silent 4GB AI Download: What It Is and How to Stop It

If you noticed your Chrome browser using up a few extra gigabytes of disk space recently, you are not alone. Users of Chrome version 148 on desktop (and possibly Android) have discovered that the browser automatically downloaded an AI model of about 4 GB without asking. Google has since confirmed the download and explained its purpose. Here is what you need to know and, more importantly, how to manage or disable it if you prefer to keep your data and storage under your own control.

What Happened

In early May 2026, several users reported that Chrome 148 had silently downloaded a large file—roughly 4 GB—to a folder inside the browser’s installation directory. The download did not show a notification or ask for permission. It was first spotted by people checking their disk usage or browsing Chrome’s internal storage information.

Google later acknowledged the behavior in a statement, explaining that the download is an on-device AI model. This model powers features such as smart compose (Google’s predictive text suggestion) and automatic tab organisation. The company stressed that the AI runs entirely locally on the user’s machine, meaning no data is sent to Google’s servers during these tasks.

Why It Matters

The main concern raised by users is the lack of transparency. A 4 GB download is significant, especially for people with metered internet connections, limited storage on laptops or older computers, or those who prefer to control what software installs on their system. Even if the AI is benign and local, the unexpected disk usage can cause problems—for example, filling an SSD that is already nearly full.

Privacy-wise, the fact that the AI works offline is reassuring. But the silent download itself raises questions about how much control users have over background data usage. Google has not yet explained why the download was not opt-in, though some speculate it was part of a staged rollout that went live without a clear user prompt.

What Readers Can Do

You can check whether the AI model has been downloaded on your machine, and you can disable or remove it if you do not want it. Below are the steps for Chrome on a desktop computer.

1. Check If the Download Happened

  • Open Chrome and type chrome://version into the address bar. Look for the “Profile Path”. The model is stored in a subdirectory of that path, usually under OptimizationGuide or OnDeviceModel. You can open that folder in your file manager to see the size.
  • Alternatively, go to chrome://settings → “Privacy and security” → “Site settings” → “Storage” and look for “Chrome” or similar entries that show cumulative storage usage. There is not a dedicated “AI model” entry, but if your Chrome profile grew suddenly by ~4 GB, it is likely the AI model.

The simplest way to stop the AI from downloading or being used is to turn off the underlying flag. Note that disabling it will remove any local AI functions, but you will not lose any other Chrome functionality.

  • In the address bar, type chrome://flags.
  • Search for “Optimization guide on-device model” (or just “optimization guide”).
  • You will see a flag labelled “Optimization guide on-device model” or similar. Set it to Disabled.
  • Restart Chrome when prompted.

After disabling the flag, the AI model should eventually be removed (Chrome may delete it automatically, or you can delete the folder manually as a precaution).

3. Remove the Already-Downloaded Model

If you want to free up the space immediately, you can delete the model folder. However, be careful: deleting Chrome’s internal files while the browser is running can cause issues. The safer approach is to disable the flag as above, then:

  • Close Chrome completely.
  • Navigate to your profile folder (found via chrome://version).
  • Look for a folder named OptimizationGuide or OnDeviceModel. Delete it.
  • Restart Chrome.

Chrome should not re-download the model after you have disabled the flag.

4. For Android Users

The silent download was primarily reported on desktop, but Android users should check their device storage if they use Chrome 148. If you want to prevent the download, you can go to Chrome’s settings (three dots → Settings) and look for “Privacy and security” → “Preload pages” or “AI suggestions”. Disabling any “on-device AI” toggles should stop the model from being fetched. The exact paths may vary by Android version.

A Note on Data Caps

If you are on a metered connection and the 4 GB download has already occurred, it may have used up a chunk of your monthly data. There is no way to reverse that data usage, but disabling the feature now will prevent any future updates of the model from auto-downloading. You can also monitor Chrome’s background data usage in your operating system’s network settings.

Sources

Google’s official statement was reported by several outlets, including Gizchina.com (May 11, 2026). The company confirmed the AI model’s purpose and that it runs locally. The steps above are based on user reports and Chrome’s existing flag settings, which have been stable for earlier versions. As always, browser flags can change between versions, so check the label carefully before toggling anything.