A few months ago, before Claude Code appeared, I was using large language models to reverse engineer an old game. At that time, although I managed to achieve some results, the process was really exhausting—requiring manual debugging and repeated testing. As a result, today I ran a loop task with Codex, and the progress within an hour far exceeded what I could achieve in several days before. This kind of efficiency boost is really crazy. Looking back now, the iteration speed of development tools has far exceeded expectations. From requiring a lot of manual intervention to now being so highly automated, the difference is a qualitative leap. This also shows that AI-assisted programming is not just a gimmick; it can significantly shorten development cycles.