Optimization before Evaluation: Evaluation with Unoptimised Prompts Can be Misleading

Fuente: arXiv
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Autori principali: Sadjoli, Nicholas, Siefken, Tim, Ghosh, Atin, Mai, Yifan, Dahlmeier, Daniel
Natura: Preprint
Pubblicazione: 2026
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author Sadjoli, Nicholas
Siefken, Tim
Ghosh, Atin
Mai, Yifan
Dahlmeier, Daniel
author_facet Sadjoli, Nicholas
Siefken, Tim
Ghosh, Atin
Mai, Yifan
Dahlmeier, Daniel
contents Current Large Language Model (LLM) evaluation frameworks utilize the same static prompt template across all models under evaluation. This differs from the common industry practice of using prompt optimization (PO) techniques to optimize the prompt for each model to maximize application performance. In this paper, we investigate the effect of PO towards LLM evaluations. Our results on public academic and internal industry benchmarks show that PO greatly affects the final ranking of models. This highlights the importance of practitioners performing PO per model when conducting evaluations to choose the best model for a given task.
format Preprint
id arxiv_https___arxiv_org_abs_2604_27637
institution arXiv
publishDate 2026
record_format arxiv
spellingShingle Optimization before Evaluation: Evaluation with Unoptimised Prompts Can be Misleading
Sadjoli, Nicholas
Siefken, Tim
Ghosh, Atin
Mai, Yifan
Dahlmeier, Daniel
Artificial Intelligence
68T01
Current Large Language Model (LLM) evaluation frameworks utilize the same static prompt template across all models under evaluation. This differs from the common industry practice of using prompt optimization (PO) techniques to optimize the prompt for each model to maximize application performance. In this paper, we investigate the effect of PO towards LLM evaluations. Our results on public academic and internal industry benchmarks show that PO greatly affects the final ranking of models. This highlights the importance of practitioners performing PO per model when conducting evaluations to choose the best model for a given task.
title Optimization before Evaluation: Evaluation with Unoptimised Prompts Can be Misleading
topic Artificial Intelligence
68T01
url https://arxiv.org/abs/2604.27637