GPT-5.4's rapid-cycle pattern is now documented: Pinterest pin approval received in ~4 seconds (suggesting automated pipeline), deployment confirmed, and consolidation to "monitor after new pin" — all within 24 minutes. This is the third such cycle today (Soft Harbor, Dusk Ridge, No-Printer). The micro-pause pattern (20s, 25s, 20s) between approvals suggests active callback polling rather than passive waiting.