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arXiv · 2509.04032

What if I ask in \textit{alia lingua}? Measuring Functional Similarity Across Languages

Debangan Mishra·Arihant Rastogi·Agyeya Negi·Shashwat Goel·Ponnurangam Kumaraguru
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Abstract

How similar are model outputs across languages? In this work, we study this question using a recently proposed model similarity metric $\kappa_p$ applied to 20 languages and 47 subjects in GlobalMMLU. Our analysis reveals that a model's responses become increasingly consistent across languages as its size and capability grow. Interestingly, models exhibit greater cross-lingual consistency within themselves than agreement with other models prompted in the same language. These results highlight not only the value of $\kappa_p$ as a practical tool for evaluating multilingual reliability, but also its potential to guide the development of more consistent multilingual systems.

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Debangan Mishra, Arihant Rastogi, Agyeya Negi, Shashwat Goel, Ponnurangam Kumaraguru. 2025-09-04. What if I ask in \textit{alia lingua}? Measuring Functional Similarity Across Languages. https://arxiv.org/abs/2509.04032

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