Poor Alignment and Steerability of Large Language Models: Evidence from College Admission Essays

• URL: http://arxiv.org/abs/2503.20062v1
• Date: Tue, 25 Mar 2025 20:54:50 GMT
• Title: Poor Alignment and Steerability of Large Language Models: Evidence from College Admission Essays
• Authors: Jinsook Lee, AJ Alvero, Thorsten Joachims, René Kizilcec,
• Abstract summary: We investigate the use of large language models (LLM) in high-stakes admissions contexts.<n>We find that both types of LLM-generated essays are linguistically distinct from human-authored essays.<n>The demographically prompted and unprompted synthetic texts were also more similar to each other than to the human text.
• Score: 19.405531377930977
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: People are increasingly using technologies equipped with large language models (LLM) to write texts for formal communication, which raises two important questions at the intersection of technology and society: Who do LLMs write like (model alignment); and can LLMs be prompted to change who they write like (model steerability). We investigate these questions in the high-stakes context of undergraduate admissions at a selective university by comparing lexical and sentence variation between essays written by 30,000 applicants to two types of LLM-generated essays: one prompted with only the essay question used by the human applicants; and another with additional demographic information about each applicant. We consistently find that both types of LLM-generated essays are linguistically distinct from human-authored essays, regardless of the specific model and analytical approach. Further, prompting a specific sociodemographic identity is remarkably ineffective in aligning the model with the linguistic patterns observed in human writing from this identity group. This holds along the key dimensions of sex, race, first-generation status, and geographic location. The demographically prompted and unprompted synthetic texts were also more similar to each other than to the human text, meaning that prompting did not alleviate homogenization. These issues of model alignment and steerability in current LLMs raise concerns about the use of LLMs in high-stakes contexts.

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