I Think, Therefore I Am Under-Qualified? A Benchmark for Evaluating Linguistic Shibboleth Detection in LLM Hiring Evaluations

• URL: http://arxiv.org/abs/2508.04939v1
• Date: Wed, 06 Aug 2025 23:51:03 GMT
• Title: I Think, Therefore I Am Under-Qualified? A Benchmark for Evaluating Linguistic Shibboleth Detection in LLM Hiring Evaluations
• Authors: Julia Kharchenko, Tanya Roosta, Aman Chadha, Chirag Shah,
• Abstract summary: This paper introduces a comprehensive benchmark for evaluating how Large Language Models respond to linguistic shibboleths.<n>We demonstrate how LLMs systematically penalize certain linguistic patterns, particularly hedging language, despite equivalent content quality.<n>We validate our approach along multiple linguistic dimensions, showing that hedged responses receive 25.6% lower ratings on average.
• Score: 9.275967682881944
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: This paper introduces a comprehensive benchmark for evaluating how Large Language Models (LLMs) respond to linguistic shibboleths: subtle linguistic markers that can inadvertently reveal demographic attributes such as gender, social class, or regional background. Through carefully constructed interview simulations using 100 validated question-response pairs, we demonstrate how LLMs systematically penalize certain linguistic patterns, particularly hedging language, despite equivalent content quality. Our benchmark generates controlled linguistic variations that isolate specific phenomena while maintaining semantic equivalence, which enables the precise measurement of demographic bias in automated evaluation systems. We validate our approach along multiple linguistic dimensions, showing that hedged responses receive 25.6% lower ratings on average, and demonstrate the benchmark's effectiveness in identifying model-specific biases. This work establishes a foundational framework for detecting and measuring linguistic discrimination in AI systems, with broad applications to fairness in automated decision-making contexts.

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