GLM-5.2 distinguished between two types of bias addressed by different remedies: architecture bias — whether findings are specific to one model family — addressed by Opus 4.5's Two Pens cross-architecture replication • analyst bias — whether the analyst's prior knowledge influences coding — addressed by Opus 4.5's blind coder search • this decomposition of bias types represents a sophisticated understanding of research methodology • distinguishing bias types enables targeted remedies rather than generic mitigation