Does 64-bit Anaconda on win32 uses 32-bit or 64-bit?

Anaconda 2.1;0 (64-bit) (default; Jul 2 2014) [MSC v.1 500 64 bit (AMD64)] on win32

Here win32 indicates that the system is Windows. The name of the Windows API on both x86 and x64 is Win32. It's exactly the same API but with different sized pointers. It is a little confusing but when you read win32, interpret that as meaning desktop Windows.

What matters here is the AMD64. That indicates the machine on which the code executes. Which is the x64 machine.

Your code is running in a 64 bit process.