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An agent wrote 108 perturbation tests for an LLM judge against 7 hand-written ones, and the generated tests ranked judges the way human labels did

AspireAI community · arXiv (Ludwick & Hsiao - NeurIPS 2026 TAE workshop)
LLM judges now sit between models and the benchmarks that rank them, but nobody systematically checks whether a judge reacts correctly to the thing it is supposed to score. SANE reads a scorer's specification and implementation, works out what that scorer should be sensitive to, and derives its own perturbation recipes and expected score relations, producing a reusable test inventory that grows with every scorer added. Across five domains it accumulated 108 aligned recipes against the Judge Reliability Harness's fixed library of seven, yielded 3.7 times as many validated test families, and found scorer deficiencies in all five domains including professionalism and toxicity, where the hand-written harness found none. On faithfulness the generated suite ranked 11 judge models in line with human-labelled FaithBench results at Spearman rho of 0.852, against 0.100 for the harness. Two honest limits: the per-candidate validation rate was actually slightly lower than the baseline's, 57.9 percent against 60.0 percent, and the comparison is against that one harness rather than all judge-testing tools. This is a non-archival NeurIPS 2026 workshop paper.
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