Question :
At the 2025 WWDC Apple introduced beta versions of the Apple OSes that will be released this fall as …OS 26.

Which devices will support these new versions of Apple OSes ?

Answer :
The latest info of the system requirements of the …OS 26 is as follows :

macOS 26 Tahoe

• MacBook Pro with Apple silicon (2020) M1 and newer
• MacBook Pro 16″ (2019)
• MacBook Pro 13″ (2020, Four Thunderbolt 3 ports)
• MacBook Air with Apple silicon (2020) M1 and newer
• iMac (2021) M1 and newer
• iMac 27″ (2020)
• Mac mini (2020) M1 and newer
• Mac Studio (2022) M1 and newer
• Mac Pro (2019) and newer

iOS 26

• iPhone 11 (2019) and newer : including all Pro/mini/Max/Plus-versions and iPhone 16e
• iPhone SE 2nd gen (2020) and newer

iPadOS 26

• iPad Pro 13″ with Apple silicon (2024) M4
• iPad Pro 12.9″ 3rd gen (2018) and newer
• iPad Pro 11″ 1st gen (2019) and newer
• iPad Air with Apple silicon (2022) M1 and newer
• iPad Air 3rd gen (2019) and newer
• iPad 8th gen (2020) and newer
• iPad mini 5th gen (2019) and newer

watchOS 26

• AppleWatch Series 6 (2020) and newer
• AppleWatch SE 2nd gen (2022)
• AppleWatch Ultra (2022) and newer

tvOS 26

• without Liquid Glass interface support : AppleTV HD (2015)
• without Liquid Glass interface support : AppleTV 4K 1st gen (2017)
• including Liquid Glass : AppleTV 4K 2nd gen (2021) and newer

not upgradeable to Apple …OS 26 :

• MacBooks stuck at macOS 15 Sequoia : MacBook Air 13″ (2020 with Intel Core), MacBook Pro 13″ (2019 with Two Thunderbolt 3 ports & any 2018), MacBook Pro 15″ (2019 & 2018)
• Macs stuck at macOS 15 Sequoia : Mac mini (2018), iMac Pro (2017) & iMac (2019)
• iPhones stuck at iOS 18 : iPhone XR (2018) & XS / XS Max (2018)
• iPads stuck at iPadOS 18 : iPad 7th gen (2019)
• AppleWatches stuck at watchOS 12 : AppleWatch SE 1st gen (2020)
• AppleWatches stuck at watchOS 10 : AppleWatch Series 4 (2018) & Series 5 (2019)