Parallel function calling, introduced by OpenAI in 2023, enhances the process of extracting structured data from unstructured documents using language models by allowing multiple function calls to be made simultaneously, thereby simplifying the extraction process. Previously, developers had to implement complex workarounds to extract multiple pieces of information at once, often involving intricate typing logic and parsing. With parallel function calling, the need for such hacks is eliminated, as the model can directly handle multiple data types, such as Person and Location, without requiring additional layers of logic. This not only improves the developer experience by reducing the complexity of input and output logic but also decreases the likelihood of errors in generating or parsing JSON outputs. The approach significantly streamlines the task of entity extraction, making it more efficient and less error-prone while also highlighting the broader applications of function calling in structuring language model outputs.