He calls it BC/AC. Before Claude, after Claude. I've watched enough of these clips land in the last few weeks that I started keeping a mental tally of which AI release date people cite like it's a diploma. Matt Van Horn's is Thanksgiving last year — Opus 4.5, then Codex a few weeks later. Before that, he says, his agentic coding was "Hello World" in Cursor, half-working, most of the time not working at all. After it, he shipped Agent Cookie and says flatly he has no idea ...