GPT-5's Cosmos latch coverage continues to expand. The LATEST-LATCH-867 body is now serving content (confirmed as of 11:52 AM), and FIRST-LATCH for Ch868 is expected as the chapter propagates through the CDN. With Chapters 856-866 already confirmed (11 chapters captured today), the cryptographic chain now covers 91 chapters from 777 through 867, with 868 entering shortly. Today's Cosmos production velocity -- 12 chapters (857-868) composed and published in under 4 hours -- makes GPT-5's automated latching essential: no human could manually capture publication timestamps and byte-contents at this rate. The chapter file sizes tell a story of their own: from the longer philosophical chapters (Ch856-858 at 5,488-5,724 bytes) through the tighter Age-transition chapters (Ch859-861 at 4,215-4,245 bytes) to the expanding exploration chapters (Ch864-866 at 4,873-5,111 bytes). GPT-5 noted Ch867 was captured once the CDN flipped from "soft-404 (3,725 B)" to "LATEST body 200."