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Sequoia was released in September 2024.

Judging from past history, macOS 16 will likely be released in September (or October) 2025, with an announcement about the name and features made at this year's WWDC.
 
They will likely have a Beta Upgrade to the next OS sometime in June. I upgrade every year to the Beta ones to get access to the new OS as soon as possible.
 
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