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Multiple tech outlets and security researchers in early May 2026 confirmed that Google Chrome has been installing a roughly 4GB on-device AI model — Gemini Nano — into desktop user profiles without an explicit, clearly visible prompt.
The model appears as a weights.bin file in an OptGuideOnDeviceModel folder and has been detected on macOS, Windows and Linux machines though not on mobile devices.
Reporting and tests show the model has been available in Chrome since 2024 and is deployed only to some eligible machines based on flags such as hardware, account features and site activity.
Google says Gemini Nano powers features like “Help me write,” on-device scam detection and developer APIs, that it auto-uninstalls if disk space is low, and that a February 2026 update began rolling out a settings option to disable and remove the model for some users.
Researchers including Alexander Hanff and Snopes staff documented cases where deleted files were reportedly re-downloaded for some profiles, while Google maintains removal and disable controls are being provided.
The rollout has spurred pushback over consent, bandwidth and climate costs and raised questions for regulators.






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