Can a 2012 Camaro beat 2014 Mustang-?

Whether a 2012 Camaro can beat a 2014 Mustang depends entirely on the *specific trims* of each car. Both the Camaro and Mustang came in a wide variety of engine options and performance packages for those years.

A base model 2012 Camaro with the V6 would likely *lose* to a 2014 Mustang GT with its V8. However, a 2012 Camaro ZL1 (with its supercharged V8) would almost certainly *win* against most 2014 Mustangs, except perhaps a Shelby GT500.

To give a definitive answer, you need to specify the engine and trim level of both the Camaro and the Mustang.