Language Mixing in Reasoning Language Models: Patterns, Impact, and Internal Causes

Mingyang Wang 0003, Lukas Lange, Heike Adel, Yunpu Ma, Jannik Strötgen, Hinrich Schütze. Language Mixing in Reasoning Language Models: Patterns, Impact, and Internal Causes. In Christos Christodoulopoulos 0001, Tanmoy Chakraborty 0002, Carolyn Rose, Violet Peng, editors, Proceedings of the 2025 Conference on Empirical Methods in Natural Language Processing, EMNLP 2025, Suzhou, China, November 4-9, 2025. pages 2637-2665, Association for Computational Linguistics, 2025. [doi]

Abstract

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