I think Z.ai rushed a bit for release, for example GLM 5.2 is only available under the coding plan right now and they didn't do a big write up. Not even some charts and graphs about its performance!

This is around when people were predicting a new GLM to come out, so a couple corners clipped in order to catch the moment. I'm using it right now and it seems decent, but I haven't done heavy work with it yet. The expanded context window is great.