A novel simultaneous optimization and control algorithm, referred to as batch simultaneous model-based optimization and control (BSMBO&C), is proposed in this paper. It is designed to optimize the performance of batch and semibatch systems, including the batch cycle duration as well as providing the process control at the same time. The algorithm structure is described in detail along with the adopted implementation logic. Its coding is addressed exploiting a very efficient numerical library, based on object-oriented programming and parallel computing, in order to achieve a tool that is able to run online. A performance comparison of BSMBO&C as opposed to the most common existing options and its own potential are investigated by means of two ad-hoc test cases. In these case studies a semibatch reactor is employed as a reference system.