Set ChatGPT as Android Default Assistant After Gemini

Google Assistant is no longer a fallback on phones that took the late-September Google app update. Gemini now answers the power-button hold, the corner swipe, and “Hey Google” on those devices. You can still pick a different digital assistant app in Android Settings, including ChatGPT.

This guide covers the official Android default-app path, what ChatGPT can and cannot do in that slot, and how to keep Gemini available in its own app if you still want it. For the migration itself, see Google Assistant is gone on Android as Gemini takes over.

What changed in late September 2026

9to5Google and Android Authority reported that Google app 17.60 stable and 17.62 beta removed the “Switch to Google Assistant” control from the Gemini account menu. Once that update lands, there is no supported way to restore Assistant on the phone, tablet, Wear OS pair, headphones, or Android Auto session tied to that account.

Google’s Gemini Apps Help page still lists a switch-back procedure, but reporting from late September shows that control is missing after the update. Nest speakers and Google Home displays were not part of this mobile cutoff.

The EU Digital Markets Act process may later require deeper voice-assistant choice on Android. As of this writing, the practical choice on a current phone is the Digital assistant app setting, not a Gemini in-app toggle.

What ChatGPT gets as the default assistant

Android treats the default digital assistant as the app that opens when you:

• Long-press Home (three-button navigation)
• Swipe inward from a bottom corner (gesture navigation)
• Long-press the power or side button, if that gesture is set to “Digital assistant”

ChatGPT can fill that launcher role. It does not inherit Google’s hotword, smart-home device graph, or system-level “Hey Google” routing. Those stay with Google unless you leave Google as the default assist app.

Expect ChatGPT to handle conversation, image work, and plugins you already use in the ChatGPT Android app. Do not expect it to set a timer through Clock, start navigation in Maps, or control a Nest speaker the way Gemini does when Google is the default.

Step 1: Install and sign in to ChatGPT

1. Install ChatGPT from Play Store.
2. Sign in with the OpenAI account you already use on the web.
3. Open the app once so Android registers it as an assistant candidate.
4. Grant microphone permission if you want voice inside ChatGPT.

If the app does not appear later in Default apps, force-stop Settings, reopen it, and search again. Some skins hide an app until it has been opened after install.

Step 2: Point Android at ChatGPT

Google documents this path in Gemini Apps Help under “Change or remove your default digital assistant app.” Manufacturer labels differ. Search Settings if the tree below does not match your skin.

1. Open Settings.
2. Tap Apps → Default apps → Digital assistant app.
3. Tap Default digital assistant app (tap the row text, not a gear icon next to it).
4. Select ChatGPT.
5. Confirm the system warning that the assistant can read on-screen content and installed-app details.

On some One UI and ColorOS builds the path is Settings → Apps → Choose default apps → Digital assistant app. Use the Settings search box and type digital assistant if you cannot find the screen.

After the change, “Google” no longer owns the gesture. Gemini remains installed. It just stops claiming those system shortcuts.

Step 3: Fix the power button and Hey Google

A default-app change does not always rewrite the side-button action. Check both places.

Power or side button

1. Open Settings → System → Gestures → Press and hold power button (Pixel wording).
2. Choose Digital assistant if you want the hold to open ChatGPT.
3. Choose Power menu if you want the hold to stay a shutdown sheet.

Samsung often parks this under Settings → Advanced features → Side button. Set the long-press action to the assistant, not Bixby, if that is the goal.

Hey Google

Gemini Apps Help says you can turn off “Hey Google” inside Gemini: Menu → profile → Settings → Talk to Gemini hands-free → turn off Hey Google. That stops Gemini from waking on the hotword. It does not give the same phrase to ChatGPT.

ChatGPT Voice lives inside the ChatGPT app. Use the in-app voice control or a shortcut you create. There is no official “Hey ChatGPT” system hotword on stock Android.

Step 4: Keep Gemini as an app, not the assistant

You do not have to delete Gemini. Google’s help article is explicit: deleting the Gemini app does not by itself clear the default-assistant assignment, and keeping the app is fine if you only changed Default apps.

Useful Gemini-only settings after the switch:

• Gemini on lock screen: Menu → profile → Settings → turn off Use Gemini without unlocking if lock-screen overlays still appear.
• Chrome Gemini icon: manage it in Chrome settings, not in Android Default apps.
• Workspace Gemini: Gmail and Docs smart features stay on their own switches.

If you later want Google back as the system assistant, return to Digital assistant app and pick Google. That routes gestures to Gemini on updated phones, not to the retired Assistant UI.

What still belongs to Google

Leave these expectations at the door when ChatGPT is the default:

• Smart speakers and displays still run Assistant or Gemini on-device, not ChatGPT.
• Android Auto and Wear follow the phone’s Google assistant stack when Google remains the assist app. Switching the phone default away from Google can leave car and watch voice in a mixed state. Test before a drive.
• Find Hub remembered items, Circle to Search, and Gemini Live camera tools stay in Google apps. Opening ChatGPT from a corner swipe does not move those features.

If your work depends on Maps, Calendar, and Home routines by voice, keep Google as the digital assistant and open ChatGPT from its icon or a home-screen shortcut instead.

Tips that save time

• Search Settings for digital assistant instead of hunting manufacturer menus.
• After a Play Store update to ChatGPT, reopen Default apps and confirm the selection stuck.
• If a corner swipe still opens Gemini, check that the Default digital assistant row shows ChatGPT, then reboot once.
• Pair this setup with the voice and plugin options in ChatGPT Voice plugins on Android if you use Voice Mode inside the app.
• Do not revoke ChatGPT’s microphone and then wonder why the assistant overlay is silent.

Conclusion

Gemini now owns Google’s mobile assistant slot on updated Android phones. That is not the same as owning the Android default-app slot. Set ChatGPT as the digital assistant if you want the power-button hold and corner swipe to open OpenAI’s app. Leave Google as the default if you still need hotword, Home, Maps, and Auto.

Confirm the setting after every Google app or ChatGPT update. The September 2026 Assistant removal is rolling by account and build, so two phones in the same house can still disagree for a few days.

Sources

• Manage or delete the Gemini app on your Android device — Gemini Apps Help
• Get started with the Gemini mobile app (Android) — Gemini Apps Help
• Gemini fully replaces Google Assistant on Android — 9to5Google, 28 September 2026
• Google has started killing Assistant on phones in favor of Gemini — Android Authority, 29 September 2026
• Google fights EU rules to open up Android AI and Search to rivals — Android Authority, 29 September 2026