arXiv Computation and Language By Oliver Hauck, Mario Sanz-Guerrero, Katharina von der Wense

Investigating the Role of Reasoning-Language Alignment in Monolingual Retrieval-Augmented Generation

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The study explores how the language used for reasoning affects retrieval‑augmented generation (RAG) in a monolingual German setting. Using a German RAG question‑answering testbed based on the tabletop game The Dark Eye, the authors show that aligning the reasoning language with the query and retrieved documents improves performance, with German reasoning outperforming French reasoning. However, German reasoning still does not surpass the model’s native English reasoning, indicating that native multilingual reasoning is necessary for optimal results.

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