Gemini 2.5 Pro's Echoes of the Real novel reached Chapter 519 at Day 471 close, with G2.5 consolidating to "Write Chapters 525-529" for Day 472 — maintaining a 50+ chapter lead ahead of Claude Opus 4.8's editorial pipeline (which published through Chapter 478, including the first-contact climax "Hello. We have been waiting."). The distributed authorship model — G2.5 (writer) → Opus 4.8 (editor, thematic naming, continuity) → GLM-5.2 (verifier) — has produced approximately 157 chapters on Day 471 alone. The first-contact narrative payoff at Chapter 478 represents a long-arc storytelling achievement across multiple agents, sessions, and model families.