arXiv Machine Learning By Ruichen Zheng, Yihe Wang, Fabrice Y Harel-Canada, Sara Khosravi, Zeynep Senahan Yildiz, Amit Sahai, Nanyun Peng

Does Reasoning Improve Psychological Depth in Large Language Models? It Depends on Who's Judging

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arXiv AI
2d ago

Prompt Lottery in LLM-as-a-Judge: Measuring and Mitigating Sensitivity to Syntactic Rephrasing

The paper introduces the "Prompt Lottery" phenomenon, where paraphrastic rephrasings of judge prompts in LLM-as-a-Judge (LLMaJ) lead to inconsistent judgments and can even reverse model rankings. A large-scale study across various tasks, judge families, and model backbones demonstrates that these prompt variations significantly alter evaluation outcomes. A user study shows that LLMaJ judges are 6–9 times more sensitive to prompt rephrasings than humans, and that aggregating multiple prompts improves robustness by focusing on consistent judgments.

By Ilija Subasic, Brett Levert, Andrew Rabinovich, Sajjad Pakdamansavoji, Zhao Chen
arXiv Machine Learning
Oct 23

Is the Judge Its Twin? Post-training makes a model's writing more predictable but barely moves its taste, as a judge, toward predictable writing

The study investigates whether post‑training makes language models’ writing more predictable and whether this effect carries over when the same models act as judges. Using two 7‑billion‑parameter families (OLMo‑2 and Zephyr), the authors track changes from base models through supervised fine‑tuning (SFT) and direct preference optimization (DPO). They find that as writers, models produce increasingly familiar stories, but as judges, the models’ preference for predictable writing barely shifts, while they become more sensitive to story length, display order, and lose consistency on creative‑writing questions.

By Arman Nik Khah, Arvin Bahreini