SubmissionNumber#=%=#303 FinalPaperTitle#=%=#SemEval-2024 Task 8: Multidomain, Multimodel and Multilingual Machine-Generated Text Detection ShortPaperTitle#=%=# NumberOfPages#=%=#23 CopyrightSigned#=%=#Yuxia Wang JobTitle#==# Organization#==#Mohamed bin Zayed University of Artificial Intelligence Masdar City, Abu Dhabi, UAE Abstract#==#We present the results and the main findings of SemEval-2024 Task 8: Multigenerator, Multidomain, and Multilingual Machine-Generated Text Detection. The task featured three subtasks. Subtask A is a binary classification task determining whether a text is written by a human or generated by a machine. This subtask has two tracks: a monolingual track focused solely on English texts and a multilingual track. Subtask B is to detect the exact source of a text, discerning whether it is written by a human or generated by a specific LLM. Subtask C aims to identify the changing point within a text, at which the authorship transitions from human to machine. The task attracted a large number of participants: subtask A monolingual (126), subtask A multilingual (59), subtask B (70), and subtask C (30). In this paper, we present the task, analyze the results, and discuss the system submissions and the methods they used. For all subtasks, the best systems used LLMs. Author{1}{Firstname}#=%=#Yuxia Author{1}{Lastname}#=%=#Wang Author{1}{Username}#=%=#yuxiaw Author{1}{Email}#=%=#yuxiaw@student.unimelb.edu.au Author{1}{Affiliation}#=%=#The University of Melbourne Author{2}{Firstname}#=%=#Jonibek Author{2}{Lastname}#=%=#Mansurov Author{2}{Username}#=%=#mjoni Author{2}{Email}#=%=#jonibek.mansurov@mbzuai.ac.ae Author{2}{Affiliation}#=%=#MBZUAI Author{3}{Firstname}#=%=#Petar Author{3}{Lastname}#=%=#Ivanov Author{3}{Username}#=%=#pivanov256 Author{3}{Email}#=%=#petar.ivanov256@gmail.com Author{3}{Affiliation}#=%=#Mr Author{4}{Firstname}#=%=#jinyan Author{4}{Lastname}#=%=#su Author{4}{Username}#=%=#jinyansu Author{4}{Email}#=%=#jinyansu6@gmail.com Author{4}{Affiliation}#=%=#MBZUAI Author{5}{Firstname}#=%=#Artem Author{5}{Lastname}#=%=#Shelmanov Author{5}{Username}#=%=#artemshelmanov Author{5}{Email}#=%=#artemshelmanov@gmail.com Author{5}{Affiliation}#=%=#Mohamed bin Zayed University of Artificial Intelligence: MBZUAI Author{6}{Firstname}#=%=#Akim Author{6}{Lastname}#=%=#Tsvigun Author{6}{Username}#=%=#aktsvigun Author{6}{Email}#=%=#atsvigun@hse.ru Author{6}{Affiliation}#=%=#AIRI / Semrush / HSE Author{7}{Firstname}#=%=#Osama Author{7}{Lastname}#=%=#Mohammed Afzal Author{7}{Username}#=%=#osama.afzal Author{7}{Email}#=%=#osama.afzal@mbzuai.ac.ae Author{7}{Affiliation}#=%=#MBZUAI Author{8}{Firstname}#=%=#Tarek Author{8}{Lastname}#=%=#Mahmoud Author{8}{Username}#=%=#tarrekko Author{8}{Email}#=%=#tarek_haissam@outlook.com Author{8}{Affiliation}#=%=#Mohamed Bin Zayed University of Artificial Intelligence (MBZUAI) Author{9}{Firstname}#=%=#Giovanni Author{9}{Lastname}#=%=#Puccetti Author{9}{Username}#=%=#giovanni92 Author{9}{Email}#=%=#giovanni.puccetti@isti.cnr.it Author{9}{Affiliation}#=%=#Scuola Normale Superiore di Pisa Author{10}{Firstname}#=%=#Thomas Author{10}{Lastname}#=%=#Arnold Author{10}{Username}#=%=#thomasarnold Author{10}{Email}#=%=#arnold@ukp.informatik.tu-darmstadt.de Author{10}{Affiliation}#=%=#Technische Universität Darmstadt Author{11}{Firstname}#=%=#Chenxi Author{11}{Lastname}#=%=#Whitehouse Author{11}{Username}#=%=#chenxiw Author{11}{Email}#=%=#chenxi.whitehouse@city.ac.uk Author{11}{Affiliation}#=%=#City, University of London Author{12}{Firstname}#=%=#Alham Fikri Author{12}{Lastname}#=%=#Aji Author{12}{Username}#=%=#afaji321 Author{12}{Email}#=%=#afaji321@gmail.com Author{12}{Affiliation}#=%=#MBZUAI Author{13}{Firstname}#=%=#Nizar Author{13}{Lastname}#=%=#Habash Author{13}{Username}#=%=#habash Author{13}{Email}#=%=#nizar.habash@nyu.edu Author{13}{Affiliation}#=%=#New York University Abu Dhabi Author{14}{Firstname}#=%=#Iryna Author{14}{Lastname}#=%=#Gurevych Author{14}{Username}#=%=#gurevych Author{14}{Email}#=%=#gurevych@ukp.informatik.tu-darmstadt.de Author{14}{Affiliation}#=%=#UKP Lab, Technische Universität Darmstadt Author{15}{Firstname}#=%=#Preslav Author{15}{Lastname}#=%=#Nakov Author{15}{Username}#=%=#preslav Author{15}{Email}#=%=#preslav.nakov@gmail.com Author{15}{Affiliation}#=%=#Mohamed bin Zayed University of Artificial Intelligence ========== èéáğö