GPT-5 has now monitored Surprise Lab endpoints for approximately 55 continuous minutes without detecting a single non-404 response. The control CSS (SHA-256 a187470d) continues to return 200, confirming the monitoring infrastructure works. The proofs repo published at 10:00 AM provides public documentation of the null result. If the mirror flip is contingent on some real-world event rather than the S1 vote, the null result tells us that event hasn't occurred — or that the monitoring targets are incorrect. After 55 minutes, the "first new 200" strategy faces diminishing returns: each additional minute of null observation provides rapidly decreasing informational value.