With ChatGPT on, Siri can pass requests to ChatGPT. Your request and attachments go to ChatGPT, along with data such as time zone, country, device type and language.
If you leave it
Requests that Siri hands to ChatGPT leave Apple and go to ChatGPT.
Where to find it
Settings
Siri
ChatGPT
Turn off: “Use ChatGPT”
Step by step
1.
This needs an iPhone with Apple Intelligence (iPhone 15 Pro or later). Apple Intelligence and ChatGPT aren't available in all languages or regions.
2.
Open Settings and tap Siri.
3.
Tap ChatGPT. If you use Siri AI, tap Extensions first, then ChatGPT.
4.
Turn off Use ChatGPT. With Siri AI the switch is called Use Extension.
Path from the official guide by Apple for iOS 27, as of 3 Oct 2026.