As part of ongoing studies by the Center for the Unified Study of Interhemispheric Asymmetries, we have selected an event during which the IMF had a large By component and a positive Bz component, while the solar wind speed and density were steady. This event allows for the study of interhemispheric asymmetries produced by large IMF By at a time when the ring current and the Region 2 current should not be large or dynamically important, as opposed to strongly southward IMF cases when one expects an enhanced ring current. Moreover, the event took place on October 8, 2012, close to equinox. This minimizes conductivity differences between the hemispheres caused by any asymmetry in solar illumination so that the major source of interhemispheric asymmetry will be the IMF By. We have simulated the event with two global MHD codes: LFM and BATS-R-US. We have extensive observations during period in question that are compared to the simulation results. In addition, the simulation results are compared to each other. We will report on these comparisons to benchmark the ability of these codes to replicate magnetospheric structure and dynamics during these solar wind and IMF conditions.