macOS 27 Intel Mac support ends at WWDC 2026, locking out four final models — the MacBook Pro 16-inch (2019), MacBook Pro 13-inch (2020), iMac 27-inch (2020), and Mac Pro (2019). Apple Silicon's Neural Engine, absent in all Intel chips, is the hardware barrier. Security patches continue through fall 2028; Rosetta 2 ends after macOS 27 in fall 2026.