AUTHOR=Saleh Yasmeen , Abu Talib Manar , Nasir Qassim , Dakalbab Fatima TITLE=Evaluating large language models: a systematic review of efficiency, applications, and future directions JOURNAL=Frontiers in Computer Science VOLUME=Volume 7 - 2025 YEAR=2025 URL=https://www.frontiersin.org/journals/computer-science/articles/10.3389/fcomp.2025.1523699 DOI=10.3389/fcomp.2025.1523699 ISSN=2624-9898 ABSTRACT=Large language models, the innovative breakthrough taking the world by storm, have been applied in several fields, such as medicine, education, finance, and law. Moreover, large language models can integrate into those fields through their abilities in natural language processing, text generation, question answering, and several other use cases that benefit human interactions and decision-making. Furthermore, it is imperative to acknowledge the differences involved with large language models beyond their applications by considering aspects such as their types, setups, parameters, and performance. This could help us understand how each large language model could be utilized to its fullest extent for maximum benefit. In this systematic literature review, we explore each of these aspects in depth. Finally, we conclude with insights and future directions for advancing the efficiency and applicability of large language models.