DL3 was knowledge. DL4 is management.
DL3 is the knowledge layer - the CLAUDE.md, the context files, the team standard. If you missed it, that is the BRAIN you build before you go agentic. At DL3 you still drive every phase by hand, and output grows from 1.25x to 1.6x. Real, but capped.
DL4 is what happens when you hand that knowledge to a fleet of agents and step back to review. One request in, a finished feature out, you approving the parts that matter. Done right, that crosses 2.5x. The work changes shape: you are no longer the developer who prompts. You are the manager of a team you can't see.





