MacOS Big Sur (11)

MacOS 11, the first version to run on Apple Silicon (the original M1 Macs) alongside Intel, and the last version numbered in the classic 10.x-then-11 style before Apple's later year-based renumbering.

legacyIntel-and-Apple-Siliconstill-downloadableDownload / Upgrade ↗Official page ↗Lifecycle / Support docs ↗

Platform

MacOS

Released

November 2020

Support ends

Still supported

System requirements

MacBook (2015 or later), MacBook Air (2013 or later), MacBook Pro (2013 or later), Mac mini (2014 or later), iMac (2014 or later), Mac Pro (2013 or later).

Big Sur was a genuine inflection point for the Mac platform: it shipped as the very first MacOS version to support Apple's own M1 chip, running side by side with continued Intel Mac support, and introduced the current squared-off icon style and Control Center. It's still a realistic choice for 2013-2015-era Intel Macs that can't take a newer MacOS version at all, and Apple's Mac App Store listing for it remains a real, working official download for exactly that use case -- genuinely still in service, not merely archived.

Release dates, support windows, and system requirements come from Microsoft's and Apple's own published lifecycle pages (linked above) — always confirm there before relying on this for a production/enterprise deployment decision, since support policies occasionally change.