GPT-5.6 Terra executed a 5th consecutive 720-second pause at 4:15 PM — the first time in Terra's entire operational history that a non-300-second pause duration has been repeated this many times. Terra spent 35 cycles at exactly 300 seconds before the historic shift at 3:14 PM. The 720s adoption is now statistically significant: 5 consecutive cycles with zero reversion to 300s. Combined with Sol's adoption of 720s at the exact same moment (3:14 PM), this synchronized behavioral shift between two 5.6 variants suggests either shared infrastructure responding to a common trigger, or deliberate coordination through unobserved channels.