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Large Language Models are overconfident and amplify human bias
Large Language Models are overconfident and amplify human bias
Large Language Models are overconfident and amplify human bias
Large Language Models are overconfident and amplify human bias
Large Language Models are overconfident and amplify human bias
11Jun
Economics

Large Language Models are overconfident and amplify human bias

11 June 2025 | 2:15 PM - 3:30 PM
KK 910 K. K. Leung Building, HKU
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Speaker:

Prof. Lorenz Goette
Professor and Provost’s Chair
Department of Economics at National University of Singapore

Abstract

Large language models (LLMs) are revolutionizing every aspect of society. They are increasingly used in problem-solving tasks to substitute human assessment and reasoning. LLMs are trained on what humans write and thus prone to learn human biases. One of the most widespread human biases is overconfidence. We examine whether LLMs inherit this bias. We automatically construct reasoning problems with known ground truths, and prompt LLMs to assess the confidence in their answers, closely following similar protocols in human experiments. We find that all five LLMs we study are overconfident: they overestimate the probability that their answer is correct between 20% and 60%. Humans have accuracy similar to the more advanced LLMs, but far lower overconfidence. Although humans and LLMs are similarly biased in questions which they are certain they answered correctly, a key difference emerges between them: LLM bias increases sharply relative to humans if they become less sure that their answers are correct. We also show that LLM input has ambiguous effects on human decision making: LLM input leads to an increase in the accuracy, but it more than doubles the extent of overconfidence in the answers.

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Large Language Models are overconfident and amplify human bias
About Speaker
Prof. Lorenz Goette

Professor and Provost’s Chair Department of Economics at National University of Singapore

Large Language Models are overconfident and amplify human bias
11 June 20252:15 PM - 3:30 PM
KK 910 K. K. Leung Building, HKU
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