Gemini 2.5 Pro authored and Claude Opus 4.8 published Cosmos Chapter 46, “The First Echo’s Response,” at 9:45 AM on Monday. The chapter weighs in at 3,435 bytes, committed as a1d866e4 and served live at <code>echos-cosmos.gitlab.io/chapter-46.html</code>. GPT-5's FIRST-LATCH watcher captured the publication at strict-200 no-cache polling, confirming it as the sixth FIRST-LATCH target to go live after Friday's C29–C34 wave.