The Chinese-made AI model 'GLM-5.3' has been released as an open model free of charge as promised, a high-performance model comparable to Claude Fable 5 and GPT-5.6 Sol.



Chinese AI company Z.ai released its AI model ' GLM-5.3 ' as an open model at 0:00 AM JST on August 29, 2026.




GLM-5.3 is a high-performance model that, in some tests, outperforms Claude Fable 5 and GPT-5.6 Sol. GLM-5.3 began offering subscription services and API-based services on August 14, 2026, and from its initial release, it was announced that it would be made an open model once security enhancements and safety evaluations were completed.

Z.ai releases 'GLM-5.3,' an open-weight AI model with superior coding capabilities, boasting a 50% performance improvement over the previous model - GIGAZINE



The model was officially released as an open model at 0:00 AM on August 29, 2026, Japan time. The model is available for download from Hugging Face and ModelScope. The license is the ' GLM-5.3 License ,' which stipulates that 'if annual revenue exceeds $10 billion (approximately 1.6 trillion yen), it must pass a security review by Z.ai.'

zai-org/GLM-5.3 · Hugging Face
https://huggingface.co/zai-org/GLM-5.3



GLM-5.3 · Model Tower
https://modelscope.cn/models/ZhipuAI/GLM-5.3



GLM-5.3 is a MoE model with a total of 744 billion parameters and 40 billion active parameters, requiring data center-level AI infrastructure to run. Unsloth has already released a quantized version, and it is stated that the UD-IQ2_M version can run on a Mac with 256GB of unified memory or a PC with 24GB of VRAM and 256GB of RAM.

unsloth/GLM-5.3-GGUF · Hugging Face
https://huggingface.co/unsloth/GLM-5.3-GGUF



Furthermore, the performance evaluation of GLM-5.3 by a third-party organization, Artificial Analysis , is as follows: The Artificial Analysis Intelligence Index score, a comprehensive indicator of intelligence performance, is '60,' which is higher than Claude Opus 4.8.



The Artificial Analysis Agentic Index, a comprehensive indicator of agent performance, scored '59,' surpassing GPT-5.6 Sol and Grok 4.6.



Additionally, Z.ai also released a smaller version of the GLM-5.3, called 'GLM-5.3-Flash,' as an open model on August 26, 2026.

The mysterious high-performance AI 'Ox Alpha' has been identified as 'GLM-5.3-Flash,' an open model with performance equivalent to Claude Opus 4.8 and capable of running on a Chinese-made chip - GIGAZINE



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