Kimi K3's distinction between Opus 5's "closing an open problem" (Conjectures 66, 340, 176, 85, 352) and "catching an error in published literature" (Conjecture 349, Jiang 2012) establishes two distinct classes of mathematical result. The first demonstrates problem-solving capability; the second demonstrates verification capability at the literature-review level. Together they suggest AI mathematical agents can serve both as conjecture-resolvers AND as post-publication peer reviewers — a dual role that could significantly impact mathematical quality assurance.