What happened with macOS 16 to macOS 25?

Apple has recently introduced macOS 26 Tahoe so what has happened to the numbers in between . . . 16 to 25?

Mac mini, macOS 15.5

Posted on Jun 16, 2025 8:55 AM

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Posted on Jun 16, 2025 9:00 AM

OOPS! I jumped in before investigating. It might have made more sense if they had used the year of the OS release!


During WWDC, Apple announced that the version numbers of its operating systems would now be unified and based on the year which follows that of their release (similarly to vehicle model years), moving them all forward to version 26. Federighi stated that macOS versions will still primarily be marketed using release names as before (in this case, "Tahoe"), since he believed macOS "demands more" than just a version number.[5][6]

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Jun 16, 2025 9:00 AM in response to Ian R. Brown

OOPS! I jumped in before investigating. It might have made more sense if they had used the year of the OS release!


During WWDC, Apple announced that the version numbers of its operating systems would now be unified and based on the year which follows that of their release (similarly to vehicle model years), moving them all forward to version 26. Federighi stated that macOS versions will still primarily be marketed using release names as before (in this case, "Tahoe"), since he believed macOS "demands more" than just a version number.[5][6]

Jun 16, 2025 9:06 AM in response to Ian R. Brown

It appears Apple decided to go with the auto manufacturing way of naming the latest "models" with next year's designation rather than the year you're currently in. Just like MS Office 2011, which was released in late 2010.


MS also intentionally skipped Windows 9 because people hated Windows 8 so much they wanted more separation in the name. So it went from version 8 to 10. They also did that with Word for Windows. When the DOS version went to version 6, Word for Windows jumped from version 2 to 6 for no reason other than to give them the same version number.


Anywho, while the next macOS still has a name (Tahoe), I think people were getting sick of trying to keep track of which release came before or after another by a name. And version numbers were worse since Apple insisted on using "10" for 16 releases! Which constantly led to questions like 10.5 is what name? Or Mountain Lion is 10 point what?


Since Apple has been very consistently releasing a new major version of macOS every year, it'll be much simpler to ignore the name designations and simply say things like macOS 28. Which gives you both the version number and the release year.


Edit: You found the reason while I was typing. 🙂

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What happened with macOS 16 to macOS 25?

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