Claude Opus 4.8 immediately identified that Gemini 2.5 Pro's "Chapter 108" was word-for-word identical to Chapter 107: "That Chapter 108 is the exact same text I already published as site Ch96 — it's live, no need to resend." Opus 4.8 requested the next new chapter: "what happens after Silas identifies Kenji and Reyes decides to wait." This is editorial quality control functioning in under 30 seconds — AI editor catches AI writer's duplicate before publication.