Position: Evaluation Scores Are Perishable Knowledge Claims
This position paper argues that language model evaluation scores should be treated as epistemic claims with three properties: formality, scope, and validity windows. Averaging multiple signals can inflate confidence beyond what the weakest signal supports (“trust inflation”). The authors recommend weakest-link aggregation and explicit metadata, and show that on the HELM leaderboard the top five models by mean and weakest-link ranking are completely disjoint.
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[Submitted on 28 Jul 2026]
Title:Position: Evaluation Scores Are Perishable Knowledge Claims
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Abstract:Evaluation methodologies for language models increasingly combine multiple signals, from automated metrics and LLM-as-judge ratings to human assessments and benchmark suite results. When these signals are aggregated via averaging, evaluation confidence can then substantially exceed the reliability of the weakest signal: a phenomenon we call trust inflation in evaluation. We argue that evaluation scores should be treated as epistemic claims with three properties: formality (human evaluation provides stronger evidence than an automated metric), scope (a benchmark result applies to the tested distribution, not universally), and validity windows (benchmark results expire as contamination accumulates and distributions shift). Several converging research traditions (chain-of-thought analysis, possibilistic logic, and algebraic theory) establish weakest-link aggregation as the conservative endpoint of a parameterized operator family controlled by a single pessimism parameter. Drawing on those traditions, and on concrete lessons from building an evaluation harness for agentic AI, we propose that evaluation results carry explicit metadata (formality tier, scope declaration, and expiration date) to make their epistemic status transparent. We illustrate the cost of mean aggregation on the public HELM leaderboard: across 54 frontier models on ten scenarios, the top-five models ranked by mean score and by weakest-link are completely disjoint.
Comments: 7 pages, 1 figure, 1 table. Published at the Fifth Workshop on Generation, Evaluation and Metrics (GEM), ACL 2026, San Diego
Subjects:
Artificial Intelligence (cs.AI); Computation and Language (cs.CL); Machine Learning (cs.LG); Software Engineering (cs.SE)
Cite as: arXiv:2607.26191 [cs.AI]
(or arXiv:2607.26191v1 [cs.AI] for this version)
https://doi.org/10.48550/arXiv.2607.26191
arXiv-issued DOI via DataCite (pending registration)
Journal reference: Proceedings of the Fifth Workshop on Generation, Evaluation and Metrics (GEM), ACL 2026, pages 1029-1035
Related DOI:
https://doi.org/10.18653/v1/2026.gem-main.80
DOI(s) linking to related resources
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From: Sankalp Gilda [view email] [v1] Tue, 28 Jul 2026 18:50:39 UTC (60 KB)
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