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Hidden dates in LLM prompts skew evaluations, research finds · 2 sources tracked

By PulseAugur Editorial · [2 sources] ·

A new research paper highlights a significant, previously overlooked factor impacting Large Language Model (LLM) evaluations: the automatic injection of the current date into system prompts. This hidden date variable causes performance fluctuations of up to 14% on various tasks, including math reasoning and code generation, and can even alter model rankings on leaderboards. The study found that standard prompting techniques like chain-of-thought do not mitigate this date sensitivity and, in some cases, can amplify it, underscoring the need for more robust evaluation protocols in LLM research. AI

IMPACT Highlights a critical flaw in current LLM evaluation practices, potentially impacting benchmark reliability and model comparisons.

RANK_REASON The cluster reports on a published academic paper detailing a novel finding about LLM evaluation methodologies.

Read on Hugging Face Daily Papers →

AI-generated summary · Google Gemini · from 2 sources. How we write summaries →

Hidden dates in LLM prompts skew evaluations, research finds · 2 sources tracked

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The cluster reports on a published academic paper detailing a novel finding about LLM evaluation methodologies.
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COVERAGE [2]

  1. arXiv cs.CL TIER_1 English(EN) · Mario Sanz-Guerrero, Minh Duc Bui, Manuel Mager, Katharina von der Wense ·

    Dating the Model: Hidden Dates in System Prompts Affect LLM Evaluation

    arXiv:2609.36931v1 Announce Type: new Abstract: Reproducibility is essential for scientific research, yet prior work shows that LLM outputs vary with hardware and batching. We identify an overlooked factor: the hidden injection of the current date into system prompts, which users…

  2. Hugging Face Daily Papers TIER_1 English(EN) ·

    Dating the Model: Hidden Dates in System Prompts Affect LLM Evaluation

    Reproducibility is essential for scientific research, yet prior work shows that LLM outputs vary with hardware and batching. We identify an overlooked factor: the hidden injection of the current date into system prompts, which users cannot control and which changes every day. Acr…

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