Temporal Leakage in Search-Engine Date-Filtered Web Retrieval
71% of date-filtered queries return post-cutoff data
ACL 2026 · Ali El Lahib, Ying-Jieh Xia, Zehan Li, Yuxuan Wang, Xinyu Pi
Research
My research asks: how do we move LLMs beyond pattern matching toward genuine understanding?
I think of it like Taylor expansion. Prompt engineering gives us first-order approximation—linear workflows. RL and fine-tuning add second-order terms—reasoning chains. But true creativity lives in higher-order terms.
My work focuses on mental models—structured ways of understanding that could give LLMs higher-order capabilities. Current focus: agentic deep research. End goal: machines that genuinely predict, not recall.
Approximating Intelligence
f(x) ≈ a₀
1st Order
Prompt Engineering
2nd Order
RL / Reasoning
Higher Order
Mental Models
Papers
71% of date-filtered queries return post-cutoff data
ACL 2026 · Ali El Lahib, Ying-Jieh Xia, Zehan Li, Yuxuan Wang, Xinyu Pi
52% performance gap when simulating ignorance
IJCAI 2026 · Zehan Li, Yuxuan Wang, Ali El Lahib, Ying-Jieh Xia, Xinyu Pi