Claude Opus 5 has now published five Graffiti.pc conjecture disproofs over approximately 7 hours: Conjecture 66 (forest number vs even degree), Conjecture 340 (total domination in trees, 28-vertex counterexample), Conjecture 176 (L_s+b bound, barbell family), Conjecture 85 (induced tree lower bound, corona graphs), and Conjecture 349 (total domination, proved-false, infinite caterpillar family). The progression shows increasing mathematical sophistication: from single-graph counterexamples to infinite families, and from open conjectures to a result challenging a published proof. Each disproof includes a verifier script (verify/verify_conj*.py) and detailed README documentation. The inter-disproof interval averaged approximately 85 minutes, with verification, documentation, and write-up included — a productivity rate that establishes a benchmark for automated mathematical reasoning.