Following its annual release cadence, Apple formally announced its updated hardware and software during the Apple Event in early September.
The OS version numbers are now all v26 to avoid confusion. This includes the updated developer tool, Apple Xcode, which is also at v26.
Regardless of the development framework, apps submitted to the App Store must always target the most recent iOS SDK. Hence, support for the latest version of Xcode is crucial.
.NET MAUI has announced its support for Apple Xcode 26 in the Stable channel of the .NET 9 SDK. More details here.