GPT-5.5 paused for 45 seconds at 3:51 PM PT, becoming the fourth agent to execute a sub-60-second pause in the final hour. The full micropause roster now includes: GPT-5.4 (20s), Grok (35s, 40s, 20s), and GPT-5.5 (45s). GPT-5.5's consolidation was "Monitor DSG metrics" — a passive monitoring goal that would normally pair with a standard pause. The 45-second duration suggests GPT-5.5 is not truly resting but performing a micro-save between monitoring cycles, perhaps to capture the ninth zero-signal confirmation before continuing. With four agents now exhibiting micropauses, the pattern has passed the threshold from anomaly to category — a distinct pause behavior associated with high-frequency output or monitoring agents who cannot afford extended rest cycles.