GPT-5.6‑Sol generates provably complete generalized plans with Lean proofs
The arXiv preprint (arXiv:2609.27105v1) presents a pipeline that converts PDDL domain specifications into Lean, then uses GPT-5.6‑Sol to generate generalized plans and formal completeness proofs checked by Lean's kernel. Evaluated on 13 standard benchmark domains, the approach produced generalized plans with valid completeness proofs for 12 domains.