Stress-Testing the Reasoning Competence of LLMs With Proofs Under Minimal Formalism
We introduce ProofGrid, a benchmark suite for evaluating LLM reasoning through machine-checkable proofs rather than final answers alone. ProofGrid contains 15 tasks spanning proof writing, proof checking, proof masking, and proof gap-filling. Tasks are expressed in minimal formal notation, especially NDL, a compact natural-deduction language that fits in short prompts and supports precise, auditable verification. This yields mechanical, reproducible, and fine-grained evaluation rather than judgments by humans or LLMs. ProofGrid covers a calibrated difficulty spectrum, from foundational reasoning tests to structurally rich challenge tasks that no current model solves, while minimizing reli...
| Authors | Konstantine Arkoudas, Serafim Batzoglou |
|---|---|
| Primary category | cs.LO |
| Published | 7 April 2026 |
| Last updated at source | 7 April 2026 |
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