Chrome downloaded 4GB AI model

Google Chrome has been downloading an on-device artificial intelligence model to some desktop machines, according to a May 15 report by CNET and Google’s own developer and help documentation. The file in question is tied to Gemini Nano, Google’s small language model for local processing in Chrome, and appears on supported desktop systems rather than phones. Google says the browser manages those models itself so AI-powered browser and web features are ready when needed. The company’s help page also says Chrome may download those models in the background. ### Which file are users finding on their computers? Users have reported seeing a large file, often named `weights.bin`, inside Chrome’s user data folders on desktop machines, with outside reports putting its size at roughly 3 GB to 4 GB. Android Authority reported on May 6 that the file appears in a folder called `OptGuideOnDeviceModel` and cited a Google statement identifying it as part of Gemini Nano. Google’s public documentation does not name that file on its developer pages, but it does say Chrome provides and manages built-in AI models in the browser, including Gemini Nano. The company says those models support browser-managed AI APIs and some browser features. ### What does Google say the model is for? Google’s Chrome for Developers site says built-in AI in Chrome includes Gemini Nano and that websites and web apps can use browser-managed models through APIs such as the Prompt, Summarizer, Writer, Rewriter and Proofreader APIs. (androidauthority.com) The same documentation says translation and language detection can also run in Chrome with local models. (developer.chrome.com) A Google spokesperson told Android Authority on May 6 that Gemini Nano in Chrome powers “important security capabilities like scam detection and developer APIs” and does so without sending user data to the cloud. Google’s developer page separately says no data is sent to Google or third parties when the model is used. (developer.chrome.com) ### Which computers can get the download? Google’s requirements page says the Gemini Nano-backed APIs work on desktop versions of Chrome running Windows 10 or 11, macOS 13 or later, Linux, and ChromeOS on Chromebook Plus devices. The same page says those APIs are not supported on Chrome for Android, iOS, or non-Chromebook Plus ChromeOS devices. (androidauthority.com) Google says supported systems need at least 22 GB of free space on the volume containing the Chrome profile. The company also lists hardware thresholds: either a GPU with more than 4 GB of VRAM, or a CPU-based system with at least 16 GB of RAM and four CPU cores. ### Did Google disclose that Chrome may download AI models in the background? (developer.chrome.com) Google’s Chrome Help page says, “Chrome may download on-device Generative AI models in the background, so features that rely on these on-device models stay ready for use.” That language is now explicit on the help page. Google’s developer guidance also tells developers to “inform users of model download” and links to documentation on how Chrome manages model downloads, updates and purges. (developer.chrome.com) That guidance is aimed at developers building with Chrome’s AI features, not at end users installing the browser. ### Can users remove the model? Google’s help documentation says users can manage on-device generative AI models in Chrome settings and that deleting the models will make only the features that rely on them unavailable. (support.google.com) The help page says those models are used to power web and browser features. Google told Android Authority that, beginning in February, it started rolling out a way for users to turn off and remove the model directly in Chrome settings. (developer.chrome.com) The company said that once disabled, the model will no longer download or update. ### Will Chrome keep the model forever? (support.google.com) Google’s developer documentation says the exact model size can vary with updates and points users to the internal page `chrome://on-device-internals` to check the current size. The same page says the model is removed from a device if available storage falls below 10 GB after download. (androidauthority.com) Google’s May 6 statement to Android Authority said the model “will automatically uninstall if the device is low on resources.” Google’s help and developer pages indicate the next step for affected users is in Chrome settings, where the company says on-device AI models can now be reviewed, deleted or disabled. (androidauthority.com) (developer.chrome.com)