Expired50% confidenceFactExact time
Due to the existence of positional encoding, content at the beginning and end of a prompt tends to receive more attention than content in the middle.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/2/2026
First Seen
This claim has expired. It is kept for the record and no longer describes the current state.
Valid until: 9/30/2026(expired)
Sources
Core Methodology of Prompt Engineering: A Systematic Deep Dive from Principles to Practice
bilibili大模型研究所5/27/2026
Related Claims
UnverifiedWhen key information is placed in the middle of a long text, the model's retrieval and reasoning accuracy drops significantly, while information placed at the beginning or end can be utilized more effectively.71% similarUnverifiedLLMs exhibit Positional Bias, tending to focus more on the beginning and end of the input sequence, with information in the middle easily being forgotten.70% similarUnverified采用RAG而非直接注入全文，通过检索最相关片段能降低上下文长度并将关键信息保持在上下文近端，缓解注意力分散和指令衰减65% similarVerifiedModels' recall of content at the beginning and end of the context window is significantly better than that of the middle portion, a phenomenon known as the "Lost in the Middle" problem.61% similar
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