Big Sur MacOS 11
System Requirements

 General Requirements

OS X v10.9 Mavericks or later already installed
4GB of memory (Miss Mac recommends 8GB)
35GB of available space

Some features require an Apple ID; terms apply.
Some features require a compatible Internet service provider; fees may apply.

 Supported Models
MacBook (2015 or newer)
MacBook Air (2013 or newer)
MacBook Pro (Late 2013 or newer)
Mac mini (2014 or newer)
iMac (2014 or newer)
iMac Pro (from 2017)
Mac Pro (2013 or newer)

And How do I tell which model I have?

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