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October 16, 2025Open Access

Positional Biases Shift as Inputs Approach Context Window Limits

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Authors

BVBlerta VeseliJCJulian ChibaneMTMariya Toneva

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Overview

Comprehensive analysis reveals how positional biases shift depending on context window limits in LLMs.

Key Points

  • The study shows that the Lost in the Middle effect is strongest when inputs occupy up to 50% of a model's context window.
  • Findings indicate that beyond this length, the primacy bias weakens while recency bias remains stable.
  • Relative input lengths are critical in understanding biases, revealing distance-based performance improvement for relevant information.
  • The results highlight the importance of successful retrieval in reasoning tasks for large language models.

Cite This Study

Veseli et al. (2025) studied this question.

synapsesocial.com/papers/68f12bfb2107091eab27a3cchttps://doi.org/10.48550/arxiv.2508.07479
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