  We compare the evolution of binary systems evolved in the MESA stellar
evolution code to those in the COSMIC population synthesis code. Our aim is to
convey the robustness of the equations that model binary evolution in the
COSMIC code, particularly for the cases of high mass stars with closely
orbiting compact object companions. Our larger goal is to accurately model the
rates of these systems, as they are promising candidates for the progenitor
systems behind energetic, longer lasting, radio bright GRB jets. These systems
also may be key contributors to the rates of binary black hole mergers
throughout our universe.
