OpenAI shares practical techniques for steering GPT-5.4 toward producing polished, production-ready frontend designs. GPT-5.4 brings improved image understanding, native image generation tool use, more functionally complete app generation, and computer use via Playwright for iterative verification. Key guidance includes defining design constraints upfront, providing visual references or mood boards, structuring pages as narratives, establishing design systems with tokens, and using low reasoning levels for simpler sites. A detailed frontend-skill prompt is provided covering composition rules, hero layout guidelines, imagery standards, motion principles, and copy discipline, installable via the Codex app.