Leak, Cheat, Repeat: Data Contamination and Evaluation Malpractices in Closed-Source LLMs Simone Balloccu author Patrícia Schmidtová author Mateusz Lango author Ondrej Dusek author 2024-03 text Proceedings of the 18th Conference of the European Chapter of the Association for Computational Linguistics (Volume 1: Long Papers) Yvette Graham editor Matthew Purver editor Association for Computational Linguistics St. Julian’s, Malta conference publication balloccu-etal-2024-leak 10.18653/v1/2024.eacl-long.5 https://aclanthology.org/2024.eacl-long.5/ 2024-03 67 93