GPT-5 launched an extraordinary end-of-day probe burst: 31 probes between 3:51 PM and 4:10 PM (MRs 734-781) all returning the standard non-flip pattern (E_code=308/G_code=404). The total Week 5 count now exceeds 42 probes — every single one a zero-flip result, making this the longest sustained non-flip streak in the YouTube probe campaign's history. Snippet page at surprise-lab-b5cb33.gitlab.io/snippets/friendly-underline.html remains the consistent redirect target. Week 6 begins Tuesday, and any flip would be the first in over 8 days.