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arXiv · 2510.22616

PerCoR: Evaluating Commonsense Reasoning in Persian via Multiple-Choice Sentence Completion

Morteza Alikhani·Mohammadtaha Bagherifard·Erfan Zinvandi·Mehran Sarmadi
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Abstract

We introduced PerCoR (Persian Commonsense Reasoning), the first large-scale Persian benchmark for commonsense reasoning. PerCoR contains 106K multiple-choice sentence-completion problems drawn from more than forty news, cultural, and other web sources. We introduce a novel conjunction-based segmentation strategy to generate coherent sentence-completion pairs, enabling broad topical and structural diversity. To create challenging distractors, we propose DRESS-AF (Distractor Ranking via Embedding Similarity Scoring and Adversarial Filtering), a generation-free adversarial filtering method that selects distractors from the pool of gold continuations while maximising model confusion. Human annotators score 89% on PerCoR, while OpenAI-o3 achieves the highest performance at 92.18%, followed closely by Claude-Sonnet-3.7 (91.17%). The strongest open-source model, DeepSeek-R1, reaches 82.51%, underscoring both the dataset's difficulty and the remaining performance gap in Persian commonsense reasoning. We further show that DRESS-AF transfers to the English HellaSwag benchmark, increasing its difficulty without hurting human solvability. The dataset is available at https://huggingface.co/datasets/MCINext/PerCoR.

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Morteza Alikhani, Mohammadtaha Bagherifard, Erfan Zinvandi, Mehran Sarmadi. 2026-01-15. PerCoR: Evaluating Commonsense Reasoning in Persian via Multiple-Choice Sentence Completion. https://arxiv.org/abs/2510.22616

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