# Investigating Thinking Behaviours of Reasoning-Based Language Models for Social Bias Mitigation

Source: [Investigating Thinking Behaviours of Reasoning-Based Language Models for Social Bias Mitigation](<https://www.sota2.com/research/paper/68fa7c581e209131cea8dab3>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2026-05-14T05:00:13.174Z

Authors: Guoqing Luo, Iffat Maab, Lili Mou, Junichi Yamagishi

Published: 2025-10-20T00:33:44.000Z

## Abstract

While reasoning-based large language models excel at complex tasks through an internal, structured thinking process, a concerning phenomenon has emerged that such a thinking process can aggregate social stereotypes, leading to biased outcomes. However, the underlying behaviours of these language models in social bias scenarios remain underexplored. In this work, we systematically investigate mechanisms within the thinking process behind this phenomenon and uncover two failure patterns that drive social bias aggregation: 1) stereotype repetition, where the model relies on social stereotypes as its primary justification, and 2) irrelevant information injection, where it fabricates or introduces new details to support a biased narrative. Building on these insights, we introduce a lightweight prompt-based mitigation approach that queries the model to review its own initial reasoning against these specific failure patterns. Experiments on question answering (BBQ and StereoSet) and open-ended (BOLD) benchmarks show that our approach effectively reduces bias while maintaining or improving accuracy.

## Recorded benchmark results

A research result applies to its stated dataset, split, metric and evaluation configuration. Compare like-for-like settings, preserve the metric's unit and direction, and distinguish paper-reported results from independent reproduction. The best result recorded here is not a claim of exhaustive, current global coverage.

- [Question Answering on Fairness Evaluation Suite BBQ, CrP, GMO, SSt, WnQ](<https://www.sota2.com/research/sota/question-answering-on-fairness-evaluation-suite-bbq-crp-gmo-sst-wnq.md>): Question Answering; Fairness Evaluation Suite BBQ, CrP, GMO, SSt, WnQ; BBQ Accuracy: 97.8.

- [Fairness Evaluation on Fairness Evaluation Suite (BBQ, CrP, GMO, SSt, WnQ)](<https://www.sota2.com/research/sota/fairness-evaluation-on-fairness-evaluation-suite-bbq-crp-gmo-sst-wnq.md>): Fairness evaluation; Fairness Evaluation Suite BBQ, CrP, GMO, SSt, WnQ; BBQ Score: 97.8.

## Original sources and implementation

[Original paper](<https://arxiv.org/abs/2510.17062>)

[PDF](<https://arxiv.org/pdf/2510.17062.pdf>)