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China’s Zhipu AI Unveils GLM-5.3 Frontier Model; Claims to Match Mythos 5 on Cyber Benchmarks

Official logo of Z.ai’s newly launched GLM-5.3 flagship model.

China-based Zhipu AI (Z.ai) has launched its latest flagship open-weight model GLM-5.3, claiming significant improvements in coding, long-horizon tasks and cybersecurity over its predecessor, along with the discovery of thousands of real-world software vulnerabilities.

Zhipu AI Market Cap Tops HK$1 Trillion as Shares Soar 42%

Zhipu AI, listed on the Hong Kong Stock Exchange as Knowledge Atlas Technology, became the first Chinese AI company to go public in January 2026. (Image: Zhipu AI)

Zhipu AI, one of China’s six ‘AI Tiger’ companies, saw its total market capitalisation cross HK$1 trillion (US$128 billion) on Monday as its Hong Kong-listed shares soared as much as 42%, days after the open-source release of its GLM-5.2 model.