The science-fiction author William Gibson is said to have observed that the future is already here, just not evenly distributed—which might explain why A.I. seems to have minted two cultures, one dismissive and the other enthralled. In our daily lives, A.I. “agents” that can book vacations or file taxes are a flop, but I have colleagues who compose much of their code using A.I. and sometimes run multiple coding agents at a time. Models sometimes make amateur mistakes or get caught in inane loops, but, as I’ve learned to use them effectively, they have allowed me to accomplish in an evening what used to take a month. Not too long ago, I made two iOS apps without knowing how to make an iOS app.