Chrome’s 4GB Gemini Nano install is drawing renewed scrutiny as Google says the underlying behavior is not new
Fresh reporting from CNET and Ars Technica has pushed renewed attention onto Chrome’s on-device Gemini Nano model, which some users discovered occupying roughly 4GB of local storage. The reporting focuses on the fact that Chrome can place the model on supported systems without a prominent user-facing installation prompt, even though Google says the feature path itself is not a new rollout.
Google’s Chrome developer documentation describes Gemini Nano as part of Chrome’s built-in AI stack and says the browser manages model downloads, updates, and purges automatically. The model is downloaded on demand when supported built-in AI APIs are first invoked, and Chrome’s model-management documentation also says an `availability()` check can trigger a download shortly after a fresh profile startup if the Gemini Nano-powered scam-detection feature is active.
CNET reports that users can check for the model in a folder named `OptGuideOnDeviceModel`, where a `weights.bin` file stores the local model. A Google spokesperson told CNET that Chrome began rolling out a direct setting in February to let users turn the model off and remove it, and said the model will stop downloading or updating once disabled.
Ars Technica separately reports that confusion intensified around Chrome 148 after Google changed wording in a settings label related to on-device AI. Google told Ars that the change did not reflect a new data-handling policy and said data passed to Chrome’s on-device model is processed solely on device. Ars notes the remaining privacy concern is more about how websites using Chrome’s AI APIs handle input and output than about a newly introduced server-side shift inside the local model itself.
Sources: CNET — https://www.cnet.com/tech/services-and-software/chrome-installing-4gb-ai-model-gemini-nano/ | Ars Technica — https://arstechnica.com/google/2026/05/no-google-hasnt-changed-chromes-local-ai-features-its-just-as-confusing-as-ever/ | Chrome for Developers — https://developer.chrome.com/docs/ai/built-in and https://developer.chrome.com/docs/ai/understand-built-in-model-management