Will iPhone XR be supported with iOS 18?

Apple has not provided any information or details about this....and won't until shortly before the release of the next operating system, which will likely appear about a year from now.

So, you are asking us to guess. Our guess would be "no". Other users might have other guesses.

Douma_ wrote:

with the newest leaks and informations, Yes iPhone XR should get iOS 18 as newest leaks and informations tells that all the iPhones with iOS 17 gonna be compatible.

And those are JUST rumors, which have NOT been confirmed by Apple. Rumors often don't wind up being true. And we simply won't know until Apple announces it, likely when Beta Testing starts this summer.

with the newest leaks and informations, Yes iPhone XR should get iOS 18 as newest leaks and informations tells that all the iPhones with iOS 17 gonna be compatible.