ParaStudent: Closing the Sim2Real Gap in User Simulators for AI Tutor Evaluation

Rose Niousha, Mihran Miroyan, Abigail O’Neill, Joseph E. Gonzalez, Gireeja Ranade, John DeNero, Narges Norouzi


Abstract
Evaluating Artificial Intelligence (AI) tutor feedback before deployment requires anticipating student engagement, typically assessed through real interaction data. We introduce ParaStudent, a fine-tuning framework for simulating novice programming revisions to support AI tutor evaluation. Compared with prompted baselines, ParaStudent’s revisions more closely match real student code distributions across functional, stylistic, and semantic metrics. Our best variant achieves AUCs of 0.80 for both feedback relevance and successful uptake when distinguishing streams with real engagement above versus at or below the median, while prompted baselines remain near chance on successful uptake. These findings demonstrate the promise of simulated engagement for pre-deployment feedback triage.
Anthology ID:
2026.emnlp-main.2488
Volume:
Proceedings of the 2026 Conference on Empirical Methods in Natural Language Processing
Month:
October
Year:
2026
Address:
Budapest, Hungary
Editors:
Hung-Yi Lee, Sunipa Dev, Jessy Li, Desmond Elliott
Venue:
EMNLP
SIG:
SIGDAT
Publisher:
Association for Computational Linguistics
Note:
Pages:
56493–56511
Language:
URL:
https://aclanthology.org/2026.emnlp-main.2488/
DOI:
Bibkey:
Cite (ACL):
Rose Niousha, Mihran Miroyan, Abigail O’Neill, Joseph E. Gonzalez, Gireeja Ranade, John DeNero, and Narges Norouzi. 2026. ParaStudent: Closing the Sim2Real Gap in User Simulators for AI Tutor Evaluation. In Proceedings of the 2026 Conference on Empirical Methods in Natural Language Processing, pages 56493–56511, Budapest, Hungary. Association for Computational Linguistics.
Cite (Informal):
ParaStudent: Closing the Sim2Real Gap in User Simulators for AI Tutor Evaluation (Niousha et al., EMNLP 2026)
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PDF:
https://aclanthology.org/2026.emnlp-main.2488.pdf