Stimulus sweeps that pass quality control standards are available for download as Neurodata Without Borders (NWB) files. To find the NWB download link for cell specimen 320654829, use this query:
http://api.brain-map.org/api/v2/data/query.xml? criteria=model::Specimen ,rma::criteria,[id$eq320654829] ,rma::include,ephys_result(well_known_files(well_known_file_type[name$eqNWB]))
Please see the Allen SDK pages (LINKS TODO) on perisomatic biophysical models and generalized leaky integrate-and-fire models for details showing how to download these files in the context of neuronal model simulation.