What's the use case for Zai/GLM? I'm currently on Claude Pro, and the Zai looks about 50% more expensive after the first 3 months and according to their chart GLM 4.7 is not quite as capable as Opus 4.5?

I'm looking to save on costs because I use it so infrequently, but PAYG seems like it'd cost me more in a single session per month than the monthly cost plan.

GLM 4.7 Flash was just a few weeks ago. 4.7 fully I think was a ways further back early December?

It's avaiable in mine, I think I paid about the same

Nope. Lite plan receives only same-tier model updates.