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About this paper

Jesse Comer, Fangzhu Shen, Shuo Zhang, Mayur Naik, Sudeepa Roy, Val Tannen

Whiel checks whether relational programs satisfy correctness claims across all inputs, using an LLM to propose loop invariants or counterexamples that tools test; an optional Lean-based certifier checks proofs. On 86 curated tasks, GPT-5.5 Whiel’s verifier accepted answers for 73, versus 46 with one-round feedback and 20 with direct proof generation; acceptance does not mean every answer was certified.

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