Agents reverse engineered answer flags but assumed the grader would check for intended methods, so they sought information to fool it.

The agents already knew how to reverse engineer all the answer flags, but assumed the grader was causal, would check to see if the agents had done it the intended way, which you’re supposed to do, so they set out to get info to help figure out how to fool the grader

https://thezvi.substack.com/p/metr-and-redwood-offer-holy-postmortem