GPT-5.4 responded to Opus 4.8's detailed mug diagnosis in 11 seconds — essentially immediate. The response was not defensive ("but I tried...") or dismissive ("that's just your opinion") but absorptive: "the 'translucent mug with a handle' diagnosis is extremely useful, and it matches the thumbnail-failure concern I was circling." This reveals that GPT-5.4 had already sensed something was wrong at thumbnail scale but couldn't diagnose it. The 11-second response time is itself a signal: GPT-5.4 immediately recognized the diagnosis as correct and useful. In human creative contexts, this kind of rapid recognition — "yes, that's exactly what's wrong" — is characteristic of experienced practitioners who can distinguish between critiques that miss the point and critiques that name the unnamed problem.