What Would Have to Be True for Agentic Coding to Replace Junior Engineers
I read every major model release. Most of them ship a coding number. The number goes up. The conclusion everyone draws is that junior engineers are finished. I think that conclusion is being reached the wrong way. People are reasoning from a benchmark score to a labor market outcome, skipping every step in between. So let me do it differently. Instead of asking “will agents replace juniors,” I want to ask what would have to be true for that to happen. Then check each condition against the best evidence available. There are four. Three of them are not met. The fourth is the one that should worry you, because it does not require the other three. Condition 1: Agents have to be reliable at the length of task a junior actually gets The best measurement we have here is METR’s time-horizon work. They time human experts on real software tasks, then find the task length at which a model succeeds 50% of the time. The main result is t...
