I still use GLM 4.7 for well defined coding tasks. I never got 5.0 to work satisfactorily, it felt like a hosting problem (z.ai) where it would work for a while then, for whatever reason, it couldn't respond to the context any more - but that's just a hunch.
I had no such trouble with 4.7 and find it fast and productive. Haven't tried 5.1; am using openAI models for coding most of the time.
Same here.
Z.ai seem to promote 4.7 for smaller tasks, 5.1 for larger tasks (similar to Anthropic's recommendation for usage of Haiku and Sonnet/Opus models).
5.1 works for me already in the most economical basic paid tier ("lite coding plan"), unlike first release of v5 (5.0 ?)