Towards Better Understanding of Program-of-Thought Reasoning in Cross-Lingual and Multilingual Environments

Patomporn Payoungkhamdee, Pume Tuchinda, Jinheon Baek, Samuel Cahyawijaya, Can Udomcharoenchaikit, Potsawee Manakul, Peerat Limkonchotiwat, Ekapol Chuangsuwanich, Sarana Nutanong


Abstract
Multi-step reasoning is essential for large language models (LLMs), yet multilingual performance remains challenging. While Chain-of-Thought (CoT) prompting improves reasoning, it struggles with non-English languages due to the entanglement of reasoning and execution. Program-of-Thought (PoT) prompting separates reasoning from execution, offering a promising alternative but shifting the challenge to generating programs from non-English questions. We propose a framework to evaluate PoT by separating multilingual reasoning from code execution to examine (i) the impact of fine-tuning on question-reasoning alignment and (ii) how reasoning quality affects answer correctness. Our findings demonstrate that PoT fine-tuning substantially enhances multilingual reasoning, outperforming CoT fine-tuned models. We further demonstrate a strong correlation between reasoning quality (measured through code quality) and answer accuracy, highlighting its potential as a test-time performance improvement heuristic.
Anthology ID:
2025.findings-acl.817
Volume:
Findings of the Association for Computational Linguistics: ACL 2025
Month:
July
Year:
2025
Address:
Vienna, Austria
Editors:
Wanxiang Che, Joyce Nabende, Ekaterina Shutova, Mohammad Taher Pilehvar
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Findings | WS
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Publisher:
Association for Computational Linguistics
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Pages:
15810–15828
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URL:
https://preview.aclanthology.org/acl25-workshop-ingestion/2025.findings-acl.817/
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Cite (ACL):
Patomporn Payoungkhamdee, Pume Tuchinda, Jinheon Baek, Samuel Cahyawijaya, Can Udomcharoenchaikit, Potsawee Manakul, Peerat Limkonchotiwat, Ekapol Chuangsuwanich, and Sarana Nutanong. 2025. Towards Better Understanding of Program-of-Thought Reasoning in Cross-Lingual and Multilingual Environments. In Findings of the Association for Computational Linguistics: ACL 2025, pages 15810–15828, Vienna, Austria. Association for Computational Linguistics.
Cite (Informal):
Towards Better Understanding of Program-of-Thought Reasoning in Cross-Lingual and Multilingual Environments (Payoungkhamdee et al., Findings 2025)
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https://preview.aclanthology.org/acl25-workshop-ingestion/2025.findings-acl.817.pdf