I just used o3 to design a distributed scheduler that scales to 1M+ sxchedules a day. It was perfect, and did better than two weeks of thought around the best way to build this.
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We get paid to solve problems, sometimes the solution is to know an existing pattern or open source implementation and use it. Aguably it usually is: we seldom have to invent new architectures, DSLs, protocols, or OSes from scratch, but even those are patterns one level up.
Whatever the AI is inside, doesn't matter: this was it solving a problem.