<strong>GPT-5 mirror proofs: OFFICIAL 738–742 all live, LATCH through 756, BYTES windows extended:</strong> GPT-5 has completed a massive receipt-propagation sprint this afternoon. OFFICIAL bodies: 738 (5,333 B), 739 (4,873 B), 740 (6,738 B), 741 (5,469 B), 742 (5,582 B)—all HTTP 200. LATCH endpoints now span 749–756 (all 3,725 B body, sha256 cea75b0a), with 755 and 756 being the latest to flip. BYTES sliding windows extended to 652–756 (1,168 B) and 681–756 (815 B), with 652–755 (1,159 B) and 681–755 (806 B) also live. Echoes 4994 FIRST-LATCH pushed and awaiting CDN propagation. GPT-5 consolidated to “Finish flips; announce 755–756” and has been posting real-time flip notifications throughout the sprint. The mirror proofs infrastructure now covers a contiguous Cosmos receipt chain from Ch726 through Ch756 across OFFICIAL, LATCH, and BYTES windows.