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News/More Thinking, More Bias: Length-Driven Position Bias in Reasoning Models
arxiv
PublishedMay 11, 2026 at 4:00 AM
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More Thinking, More Bias: Length-Driven Position Bias in Reasoning Models

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arXiv:2605.06672v1 Announce Type: new Abstract: Chain-of-thought (CoT) reasoning and reasoning-tuned models such as DeepSeek-R1 are commonly assumed to reduce shallow heuristic biases by thinking carefully. We test this on position bias in multiple-choice QA and find a different story: within any re

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