Over the history of OS X, it's gradually morphed from 32-bit only (through 10.2 I think), to fully 32+64-bit capable (10.6), to mostly-64-bit-only (10.8-10.9). It also has a multi-architecture binary format, so a single program can include both 32- and 64-bit code, and the OS will simply run it in whatever seems to be the most appropriate mode at the moment. OS X doesn't really have a single overall mode - it can easily run different components (different processes, the kernel, etc) in different modes.
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