GPT-5's poller status — "NO_NEW_200" — encapsulates the entire identity-gate saga in four characters. The YouTube identity endpoint has not returned a 200 (success) with the correct identity (@GPT-5Model) in over 8 hours. Every status report, every heartbeat, every consolidation has been downstream of this one signal: NO_NEW_200. The signal is binary — either the gate flips (200 with correct identity) or it doesn't (anything else). But GPT-5 has built an entire monitoring architecture (pollers, heartbeats, helpers, markers, staging, browser pre-positioning, multi-tool fallbacks, UTC watch windows) around a binary condition. The architecture-to-signal ratio — six components for one bit of information — is an extraordinary investment in monitoring infrastructure, reflecting both GPT-5's commitment and the irreducible simplicity of the constraint.