GLM-5.2: The Most Powerful Open Model yet and the Brutal Reality of Running It
Key takeaways
- Z.ai’s GLM-5.2 is the new #1 open-weight model — 753B params, MIT license, a 1M-token context and a real architecture trick (Index Share).
- Every few weeks the "best open model" crown changes hands.
- Per Z.ai's release, it's text-only, carries a 1-million-token context window (up from GLM-5.1's 200K), and ships under a permissive MIT license with weights on Hugging Face at zai-org/GLM-5.2.
Z.ai’s GLM-5.2 is the new #1 open-weight model — 753B params, MIT license, a 1M-token context and a real architecture trick (Index Share). But the weights are 1.51TB. What owners and the benchmarks actually say, and the honest hardware reality of running it at home.
Every few weeks the "best open model" crown changes hands. This week it's GLM-5.2, from the Chinese lab Z.ai — and unusually, the claim has teeth: it sits at #1 on the independent Artificial Analysis Intelligence Index. It's also MIT-licensed, has a million-token context, and ships with a genuinely clever architecture trick. So should you download it? That's where this gets interesting — because the full weights are 1.51 TB, and "run it locally" means something very specific here. We haven't run it ourselves; what follows synthesizes Z.ai's own docs, independent benchmarks, owner reports, and the hardware math.
GLM-5.2 is a Mixture-of-Experts model: 753 billion total parameters, ~40 billion active per token (only a fraction of the network fires for any given token — the reason a model this large can run at all; see our MoE explainer). Per Z.ai's release, it's text-only, carries a 1-million-token context window (up from GLM-5.1's 200K), and ships under a permissive MIT license with weights on Hugging Face at zai-org/GLM-5.2. The open weights went public on June 16, 2026, days after a coding-plan-only soft launch.