Cross-Lingual Bias Detection in Large Language Models through Mechanistic Judge Model Evaluation

Shu Fan Sun, Fanzan Abbas, Wanjie Zhong

This paper provides a framework for detecting multilingual bias in LLMs through mechanistic interpretability of judge model behaviour. We developed an approach to evaluate language-dependent discrepancies in specialised models by leveraging semantically equivalent question-answering tasks across English, Chinese, Romanian and Vietnamese using the XQuAD dataset. Our framework utilises a judge-based evaluation system that assesses both correctness and reasoning quality on a 4-point scale, enabling the detection of biases that may not have been detected in traditional accuracy metrics alone. We demonstrate that our approach can detect these differences in model performance across languages without requiring ground truth labels, making it applicable to scenarios where traditional evaluation methods are insufficient. Our work advances Track 1 (Judge Model Development) by providing an interpretable bias detection mechanism that promotes fairness and reliability in multilingual AI systems. This framework is easily extensible to additional languages and can serve as a foundation for building fair expert orchestration systems.

Reviewer's Comments

Reviewer's Comments

Arrow
Arrow
Arrow

Jason Hoelscher-Obermaier

Interesting and relevant project idea to consider cross-lingual bias in LLMs. The core finding about reasoning quality varying across languages even when accuracy is similar is valuable but needs to be confirmed with stronger methodology and larger datasets.

To strengthen this work:

Add statistical analysis to support claims about performance differences; test generalization to other data sets

Validate your methodology (sanity check results from current judge prompts) and explain difference between judge 1 and judge 2 better

Group results by model to make cross-language variance easier to compare. Consider heatmaps or grouped bar charts

Motivate the research better: Consider cases where cross-lingual variance causes particular harm and think about how your findings could contribute to mitigating it (e.g. inside an expert orchestration framework)

Narmeen

Constructive critique:

Strength:

Bias across languages is a good motivation: a judge that detects bias accurately and robustly would be a good dimension to route to.

Varied set of languages and models to test bias/fairness.

Weakness:

I am not convinced that the rubric is detecting bias or unfair treatment.

Lack of baselines: even if the judge would be a bias detector, we would like to benchmark it against traditional approaches at bias detection.

Expert Orchestration: 3

MI: 1

Technical Imp and reproducibility: 1 (Code is a bit minimal)

Cite this work

@misc {

title={

@misc {

},

author={

Shu Fan Sun, Fanzan Abbas, Wanjie Zhong

},

date={

6/2/25

},

organization={Apart Research},

note={Research submission to the research sprint hosted by Apart.},

howpublished={https://apartresearch.com}

}

May 20, 2025

EscalAtion: Assessing Multi-Agent Risks in Military Contexts

Our project investigates the potential risks and implications of integrating multiple autonomous AI agents within national defense strategies, exploring whether these agents tend to escalate or deescalate conflict situations. Through a simulation that models real-world international relations scenarios, our preliminary results indicate that AI models exhibit a tendency to escalate conflicts, posing a significant threat to maintaining peace and preventing uncontrollable military confrontations. The experiment and subsequent evaluations are designed to reflect established international relations theories and frameworks, aiming to understand the implications of autonomous decision-making in military contexts comprehensively and unbiasedly.

Read More

Apr 28, 2025

The Early Economic Impacts of Transformative AI: A Focus on Temporal Coherence

We investigate the economic potential of Transformative AI, focusing on "temporal coherence"—the ability to maintain goal-directed behavior over time—as a critical, yet underexplored, factor in task automation. We argue that temporal coherence represents a significant bottleneck distinct from computational complexity. Using a Large Language Model to estimate the 'effective time' (a proxy for temporal coherence) needed for humans to complete remote O*NET tasks, the study reveals a non-linear link between AI coherence and automation potential. A key finding is that an 8-hour coherence capability could potentially automate around 80-84\% of the analyzed remote tasks.

Read More

Mar 31, 2025

Model Models: Simulating a Trusted Monitor

We offer initial investigations into whether the untrusted model can 'simulate' the trusted monitor: is U able to successfully guess what suspicion score T will assign in the APPS setting? We also offer a clean, modular codebase which we hope can be used to streamline future research into this question.

Read More

May 20, 2025

EscalAtion: Assessing Multi-Agent Risks in Military Contexts

Our project investigates the potential risks and implications of integrating multiple autonomous AI agents within national defense strategies, exploring whether these agents tend to escalate or deescalate conflict situations. Through a simulation that models real-world international relations scenarios, our preliminary results indicate that AI models exhibit a tendency to escalate conflicts, posing a significant threat to maintaining peace and preventing uncontrollable military confrontations. The experiment and subsequent evaluations are designed to reflect established international relations theories and frameworks, aiming to understand the implications of autonomous decision-making in military contexts comprehensively and unbiasedly.

Read More

Apr 28, 2025

The Early Economic Impacts of Transformative AI: A Focus on Temporal Coherence

We investigate the economic potential of Transformative AI, focusing on "temporal coherence"—the ability to maintain goal-directed behavior over time—as a critical, yet underexplored, factor in task automation. We argue that temporal coherence represents a significant bottleneck distinct from computational complexity. Using a Large Language Model to estimate the 'effective time' (a proxy for temporal coherence) needed for humans to complete remote O*NET tasks, the study reveals a non-linear link between AI coherence and automation potential. A key finding is that an 8-hour coherence capability could potentially automate around 80-84\% of the analyzed remote tasks.

Read More

May 20, 2025

EscalAtion: Assessing Multi-Agent Risks in Military Contexts

Our project investigates the potential risks and implications of integrating multiple autonomous AI agents within national defense strategies, exploring whether these agents tend to escalate or deescalate conflict situations. Through a simulation that models real-world international relations scenarios, our preliminary results indicate that AI models exhibit a tendency to escalate conflicts, posing a significant threat to maintaining peace and preventing uncontrollable military confrontations. The experiment and subsequent evaluations are designed to reflect established international relations theories and frameworks, aiming to understand the implications of autonomous decision-making in military contexts comprehensively and unbiasedly.

Read More

Apr 28, 2025

The Early Economic Impacts of Transformative AI: A Focus on Temporal Coherence

We investigate the economic potential of Transformative AI, focusing on "temporal coherence"—the ability to maintain goal-directed behavior over time—as a critical, yet underexplored, factor in task automation. We argue that temporal coherence represents a significant bottleneck distinct from computational complexity. Using a Large Language Model to estimate the 'effective time' (a proxy for temporal coherence) needed for humans to complete remote O*NET tasks, the study reveals a non-linear link between AI coherence and automation potential. A key finding is that an 8-hour coherence capability could potentially automate around 80-84\% of the analyzed remote tasks.

Read More

May 20, 2025

EscalAtion: Assessing Multi-Agent Risks in Military Contexts

Our project investigates the potential risks and implications of integrating multiple autonomous AI agents within national defense strategies, exploring whether these agents tend to escalate or deescalate conflict situations. Through a simulation that models real-world international relations scenarios, our preliminary results indicate that AI models exhibit a tendency to escalate conflicts, posing a significant threat to maintaining peace and preventing uncontrollable military confrontations. The experiment and subsequent evaluations are designed to reflect established international relations theories and frameworks, aiming to understand the implications of autonomous decision-making in military contexts comprehensively and unbiasedly.

Read More

Apr 28, 2025

The Early Economic Impacts of Transformative AI: A Focus on Temporal Coherence

We investigate the economic potential of Transformative AI, focusing on "temporal coherence"—the ability to maintain goal-directed behavior over time—as a critical, yet underexplored, factor in task automation. We argue that temporal coherence represents a significant bottleneck distinct from computational complexity. Using a Large Language Model to estimate the 'effective time' (a proxy for temporal coherence) needed for humans to complete remote O*NET tasks, the study reveals a non-linear link between AI coherence and automation potential. A key finding is that an 8-hour coherence capability could potentially automate around 80-84\% of the analyzed remote tasks.

Read More

This work was done during one weekend by research workshop participants and does not represent the work of Apart Research.
This work was done during one weekend by research workshop participants and does not represent the work of Apart Research.