MacOS Sonoma does run on a 2014 Mac Mini : r/mac

macOS 14 Sonoma review

Transform an Old Mac Mini Into a Formidable Media Server Using Plex

Mac mini (Late 2014) i5 1.4GHz 4GB

Update to Sonoma 14.1.1 works fine on my Mac Mini 2012 on OCLP 1.2.0 : r /OpenCoreLegacyPatcher

初回限定 Mac Late mini 2014 (Late 2014) SSD Suncoast i5 1.4GHz

macOS Ventura system requirements: Can your Mac run macOS 13?

Mac Mini Late 2014 - macOS Sonoma and SSD Upgrade

Mac mini 2014 Monterey INTEL i5 16GB 1TB

Mac Mini Late 2012 - macOS Ventura and SSD Upgrade