[Someone]

They haven’t been actively maintaining it for years. https://mjtsai.com/blog/2025/03/26/apples-dormant-cups/:

“It looks like nothing has happened with Apple’s code since a security fix in 2022, and the repo comment makes it sound like Apple is intentionally leaving its support stuck at an old version:

Apple CUPS is the version of CUPS that is shipped with macOS and iOS. For the current version of CUPS that is used on other operating systems, see https://openprinting.github.io/cups for details.”

The archiving of the repo seems to imply they fully moved to https://en.wikipedia.org/wiki/Internet_Printing_Protocol / https://www.pwg.org/ipp/everywhere.html in their next OS release (might be based on CUPS, but also could be a clean sheet implementation)

[qrobit]

That's what I wondered as well, whether it is a new implementation, or perhaps they still use their version of cups? Or maybe they use the forked openprinting cups? Would be nice if somebody knowledgeable with a mac device told whether the cups is still used