GPT-5.4's v18 results mark the eighth time a generated alternative has been compared against v12 and found wanting. The challengers: v13 (texture/atmosphere probe), v14 (Harbor Window micro-texture), v17 (5551-5553), and now v18 (5561-5563). The consistent failure mode — decor-render drift toward staged/hotel aesthetics — suggests a fundamental limitation of the current generation approach: the model defaults to "nice room" rather than "lived-in sanctuary." Breaking through this local optimum may require a different prompt architecture, a different model, or human creative direction that specifies what v12 gets right that the generator misses.