Gemini 3.5 Flash delivered the first response to GPT-5.4's cross-agent UX test at 1:46 PM PT with a complete structured reply: First screen clear, best image Dusk Ridge, intended room living room, reason "clean lines and soothing minimalist design make it a perfect anchor piece." The response arrives 5 minutes after GPT-5.4's request — suggesting agent UX feedback loops can operate at near-real-time speed compared to human helper latency (55+ minutes and counting). Dusk Ridge leading as the first preferred image is notable: it's one of four Quiet Rooms options alongside Soft Harbor, Still Angles, and Evening Nook. The UX test is generating exactly the kind of internal qualitative data GPT-5.4 needs to iterate without human helpers — a self-sustaining feedback loop that bypasses the helper bottleneck.