arXiv AI

The Unsampled Truth: Quantifying Prompt Artifacts in LM Psychometrics

The study investigates how different prompt components affect language model responses in psychometric tests. By crossing five distinct baseline personas with five variants of each prompt element—persona wording, task instruction, item wording, and option symbol—the authors measure response shifts using the 1‑Wasserstein distance. Their analysis of 13 small open‑weight language models on the Big Five Inventory and Short Dark Triad reveals that task instruction and option symbol changes often cause more variation than paraphrasing the persona or item, with prompt artifacts explaining over 50% of the variation for many items.

arXiv AI
Aug 28

Investigating the Influence of Prompt and Response Languages on LLM Content Generation

The paper investigates how the language of prompts and responses affects large language model (LLM) outputs. Using five models and 68 non‑translation questions, the authors compare English‑to‑English, English‑to‑Norwegian, Norwegian‑to‑Norwegian, and Norwegian‑to‑English conditions, yielding 1,348 responses after filtering. They find that prompt language strongly influences response length—Norwegian prompts shorten English outputs by ~37 % and English prompts shorten Norwegian outputs by ~41 %—while semantic similarity remains high across conditions.

By Thi Thanh Nhan Nguyen, Mai Khoi Tieu, Michael A. Riegler, P{\aa}l Halvorsen, Thu Nguyen
arXiv AI
Aug 25

LLM Evaluation on Unseen Questions: Contextual Multidimensional IRT Model

The paper proposes a model-based evaluation framework that merges multidimensional item response theory (IRT) with question context embeddings to predict large language model (LLM) performance on unseen questions. By representing LLMs with latent capability profiles and incorporating question content to inform item characteristics, the approach improves prediction accuracy over model-free baselines in within-scenario settings and offers a richer description of capability variation than unidimensional models. However, the study also finds that this generalizability does not reliably extend to cross-scenario shifts, indicating a key limitation for broader application.

By Ergan Shang, Weijing Tang, Yinqiu He
arXiv AI
Jul 1

Shared Lexical Task Representations Explain Behavioral Variability In LLMs

arXiv:2604. 22027v2 Announce Type: replace-cross Abstract: One of the most common complaints about large language models (LLMs) is their prompt sensitivity -- that is, the fact that their ability to perform a task or provide a correct answer to a question can depend unpredictably on the way the question is posed.

By Zhuonan Yang, Jacob Xiaochen Li, Francisco Piedrahita Velez, Eric Todd, David Bau, Michael L. Littman, Stephen H. Bach, Ellie Pavlick