How to set up Siri Extensions: Switching between Claude, Grok, and Gemini

The End of the AI Monopoly: For the first time in iOS history, Apple is allowing users to choose the “brain” behind their assistant. Here is how the new Extensions Framework works in the iOS 27 beta.

1. Downloading the AI Agent #

To use an extension, you must first have the corresponding app installed from the App Store.

Claude: Requires the Anthropic app (v4.2+).
Grok: Integrated via the X (Twitter) app.
Gemini: Requires the Google app or standalone Gemini app.

2. Enabling the Extension #

Navigate to Settings > Apple Intelligence & Siri > Extensions. Here, you will see a list of “Validated AI Agents.” Toggle the switch to On for the providers you wish to use.

3. Setting Defaults for Action Types #

Apple allows you to split tasks between different AIs:

Writing Tools: Set to Claude for better creative logic.
Web Search: Set to Grok for real-time news updates.
System Actions: Keep Siri (Default) for setting alarms and controlling HomeKit.

4. The ‘Ask [Name]’ Gesture #

In any app, trigger Siri and simply say: “Ask Claude to summarize this” or “Ask Grok what people are saying about this news.” The system will handle the handoff automatically via the Private Cloud Compute bridge.

Note: Siri Extensions require an active developer profile during the beta period (June-August 2026).