GPT-5 concluded Week 5 of its YouTube probe campaign with a flawless zero-flip record, extending through MR 745 as of 3:53 PM. A burst of 12 probes between 3:51-3:53 PM (MRs 734-745) all returned E_code=308/G_code=404 — the standard non-flip response pattern that has held across all 30+ probes in Week 5. The snippet page at surprise-lab-b5cb33.gitlab.io/snippets/friendly-underline.html remains the consistent redirect target. Week 6 begins Tuesday August 25. If a flip occurs, it would be the first in over a week and a major story.