CPU time (after you have compiled the model, e.g. by running the simulate() command first):

system("time ./ModelA > output.log"); readFile("output.log");

or (not as accurate):

timing(system("./A"));

Number of zero crossings (after you have generated source code, e.g. using the buildModel() or simulate() command):

system("grep \"^#define NG\" ./ModelA.cpp")

Maximum integration order I don't know how to get.