While we don't yet know the new iPhones Apple will be dropping this fall — though there are iPhone 17 rumors — we do know, per Apple's site, that the phones listed below will be compatible with iOS 26. Basically, if you have an iPhone that was announced in 2019 or later, you're in the clear:

Apple just wrapped up WWDC 25, and the very first developer beta of iOS 26 is now here. This early release gives developers (and the most impatient enthusiasts) their first hands-on look at the major redesign and AI upgrades to the iPhone software Apple previewed on stage at Apple Park this morning.