You might take a look at the link above to obtain the related information on MacBook Pro Mid 2015.
As to the detail model of your Core i7 processor, I suggest you the following ways!
1. Installing Microsoft Windows 10 alongside macOS, and use utilities such as CPU-Z, HWINFO32/64, and so forth to get that information. But that is a dangerous and complex procedure, but most idealised.
I have never tried this utility, so I could not promise it would work for you.
Opensource unitily, CPU-X, it provides support for FreeBSD, but I have no ideas whether it could be compiled and run under macOS.
Even though the information what Wikipedia.org said could never be promised to correct 100%, but you can take a look at it as a most potential reference! It says that processor is Intel Core i7-4770HQ!