Z.ai releases GLM-5.2: 753B parameter open weights LLM with 1M token context window
By
Simon Willison
Summary
Chinese AI lab Z.ai released GLM-5.2, a 753B parameter Mixture-of-Experts open weights LLM under MIT license. The model features 40 active parameters, a 1 million token context window (up from 200K in GLM-5.1), and is text-only input. It was first released to coding plan subscribers on June 13th, then publicly on June 16th. The article notes strong community buzz around the release.
Source
bskyZ.ai releases GLM-5.2: 753B parameter open weights LLM with 1M token context windowsimonwillison.netKey quotes
· 4 pulledGLM-5.2 is probably the most powerful text-only open weights LLM
Similar in size to their previous GLM-5 and GLM-5.1 releases, this is 753B parameter, 1.51TB monster—with 40 active parameters (Mixture of Experts)
GLM-5.2 has a 1 million token context window, up from GLM-5.1's 200,000
The buzz around this model is strong.
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