# Can I delete Chrome’s OptGuideOnDeviceModel (Gemini Nano)?

- URL: https://moreroom.app/folders/ai-chrome-ondevice
- Item: Chrome on-device AI model (Gemini Nano)
- Location: `~/Library/Application Support/Google/Chrome/OptGuideOnDeviceModel`
- Verdict: Review first — Might hold something you care about. Look inside before removing it.
- Comes back on its own: yes
- Typical size: 2–4 GB
- From the app: Chrome > Settings > System: turn off on-device AI, then Chrome removes the model.
- Source: MoreRoom rules catalogue (2026-10-17), by Yando Pte. Ltd.

## What is it?

On Macs that meet its hardware requirements, Google Chrome downloads Gemini Nano, a small language model used for built-in AI features, into `~/Library/Application Support/Google/Chrome/OptGuideOnDeviceModel`. The model file is often around 4 GB.

## What happens if you delete it?

If you only delete the folder, Chrome downloads the model again while its on-device AI features are turned on.

## How to remove it properly

In Chrome, open Settings › System and turn off on-device AI; Chrome then removes the model itself. Deleting the folder by hand only helps while that setting is off. Where the setting is missing in your Chrome version, the model is managed through chrome://flags or policy.

## Before you delete it

Chrome features that rely on the local model stop working until it is downloaded again.