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AmigaOS 4.1 fe came out 4 years ago so it’s not that ancient.

AmigaOS 4 is PowerPC only, it does not run on this hardware at all.

The last version of AmigaOS 3.1 for classic hardware came out in 2016.

I mean technically it was a "new" release but they fixed 4 minor bugs in a codebase that was otherwise not touched in 20+ years.

If you want the most modern AmigaOS to run on classic hardware that's obviously 3.9 which was released in 2000.

Or AROS's 68000 build.

(AROS is an AmigaOS open source clone. Source compatible for all other platforms, such as Intel, binary compatible for 68000.)