LibRoadrunner is a high-performance SBML based simulator for Systems and Synthetic Biology that uses LLVM to generate very efficient runtime code. SBML Arrays package is under development and provides support for expressing an array of components of a computational biological model. Arrays make it easier to represent large complex regular systems in a standard way. Currently, iBioSim is the only tool that supports SBML arrays. The goal of the project is to implement “SBML Array” support in libRoadRunner and ensure compatibility between libRoadRunner and iBioSim so that models can be exchanged correctly.