Testing GLM-5.2 on a Real Rails Upgrade

Every few weeks, a new open-source model appears with claims that it matches the frontier. I’ve watched this pattern long enough to be skeptical — the charts are fine for YouTube content, but they don’t tell you how a model behaves on a codebase that hasn’t been touched in years, with deprecated gems, a Node-dependent asset pipeline, and data that needs to move between databases. When GLM-5.2 from…