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Policy reasoning benchmarks were hand-built, so a generator now writes them and finds where models go wrong

AspireAI community · arXiv (Sam Kouteili et al.)
Models deployed in regulated settings must apply a given rule to a situation and return a verdict, a capability called deontic reasoning. Benchmarking it was slow because the datasets were hand-crafted. DeoGen generates the benchmark instead: it autoformalises policy rules into first-order logic, builds decision trees of possible outcomes, and turns each root-to-leaf path into a benchmark entry, with each tree producing combinatorially many entries relative to its depth. Paths that end at a leaf entail a verdict; non-leaf paths measure whether a model can abstain when the information is insufficient. Frontier models returned the correct verdict 89-92% of the time, but performance fell to 22-40% correct on entries lacking enough information for a verdict, even with explicit instructions to abstain. The generator is scalable and parametrisable, though a generated benchmark tests the generator's formalisation as much as the model's reasoning.
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