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[[!meta title="Is there a 64-bit version?"]]

There are currently no plan for 64-bit userland for the short term, but there
are plans for 64-bit kernelland with 32-bit userland, which will notably permit
to efficiently make use of more than 2 GiB memory and provide 4 GiB userland
addressing space. The kernel support was merged into GNU Mach, the currently
missing bit is the 32/64 mig translation for kernel RPCs.

That being said, you can always run a 32-bit version on a 64-bit machine, it
just works, processes are just limited to a couple GiB available memory.