Every Greedy Metric Said the Model Was Improving. Then pass@64 Fell From 0.83 to 0.19
Every number we watched said the run was working. Correct-per-sample probability tripled. The greedy accuracy curve was climbing. By the numbers on our dashboard, this was a textbook RLVR win. Then we sampled the checkpoint 64 times per problem instead of once. pass@64 had collapsed from 0.83 to 0.