Z.ai is an AI company that released its GLM-5.3 model as an open model on August 29, 2026, following an earlier commitment. The model performs competitively in third-party evaluations.
Z.ai made its most recent public move on August 29, 2026, releasing the GLM-5.3 model as an open model. The release came after the company had promised an open release on August 14. GLM-5.3 is a mixture-of-experts model with 744 billion total parameters and 40 billion active parameters. Third-party organization Artificial Analysis gave it an Intelligence Index score of 60 and an Agentic Index score of 59, with the model surpassing Claude Fable 5 and GPT-5.6 Sol in those tests.
The company's focus has been on the open-weight ecosystem. The August 29 release places GLM-5.3 in that space, and the company's earlier commitment on August 14 set the expectation for this move. The scores from Artificial Analysis indicate that GLM-5.3 outperforms two leading closed models in the third-party evaluations.
No other details about Z.ai's operations, other products, or business plans appear in the available stories. The dossier is limited to this single release and its context.
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Z.ai released its GLM-5.3 model as an open model on August 29, 2026, at 0:00 Japan time. The MoE model has 744 billion total parameters and 40 billion active parameters. Third-party organization Artificial Analysis gave it an Intelligence Index score of 60 and an Agentic Index score of 59.
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