AIBearisharXiv – CS AI · Apr 107/10
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Self-Preference Bias in Rubric-Based Evaluation of Large Language Models
Researchers reveal that Large Language Models exhibit self-preference bias when evaluating other LLMs, systematically favoring outputs from themselves or related models even when using objective rubric-based criteria. The bias can reach 50% on objective benchmarks and 10-point score differences on subjective medical benchmarks, potentially distorting model rankings and hindering AI development.