zai-org just dropped GLM-5.2, a 753B-parameter open-weights model under MIT license that the team positions as competitive with Claude Opus 4.8 and GPT-5.5, especially on long-horizon coding and agentic tasks. The weights are already live on Hugging Face with hosted access through HuggingChat, and third-party platforms added day-zero support.
We are entering uncharted territory…
Wow.
@Zai_org GLM 5.2 is a marvel! It is *at least* as good as Opus 4.8 and GPT 5.5. It's super fast, inexpensive, and not too verbose.
It responds with nuance and judgement, & handles long context VERY well.
I've never experienced an open weights model like this before.
Anyone can download the weights and run them locally via Transformers, vLLM, or Unsloth, which lowers the barrier for on-premise use and sidesteps API rate limits.
The model card shows strong numbers on coding suites like SWE-bench Pro and Terminal-Bench, yet all results come from zai-org itself with no independent verification reported so far.
Users are amused by the term “ClosedSourcistan” in replies about the open-weight GLM-5.2 rivaling Opus because it offers a witty jab at closed-source AI.
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To all the newcomers excited to try Opus 4.8-level models at home: welcome to OpenWeightLand!
Things work a little differently here than in ClosedSourcistan. Might seem strange at first but you'll quickly get used to it: - there are many providers for the same model and they compete on price and features. - as a result intelligence is abundant and typically much cheaper - you can run the model on-prem, in your region, locally, or with the provider of your choice - you can fine-tune it, modify it, and build businesses on top of it without asking anyone for permission
Turns out open weights create markets, not kingdoms.
A good central train station to start exploring is the Hugging Face page for GLM-5.2 under "Use this model": -> https://huggingface.co/zai-org/GLM-5.2
And if you just want to chat with it, it's free on HuggingChat: -> https://huggingface.co/chat/
@Thom_Wolf “ClosedSourcistan” 🤣🤣🤣
That’s a good one
