A Tsinghua lab that went public
Zhipu AI was founded in Beijing in 2019 as a spinout of Tsinghua University's Knowledge Engineering Group, led by professors Jie Tang and Juanzi Li. Zhang Peng is chief executive. The company rebranded internationally as Z.ai in mid-2025, and on January 8, 2026 it listed on the Hong Kong Stock Exchange under ticker 2513, the first of China's so-called AI tiger startups to go public. [1][2]
By August 2026 its market capitalization had reached roughly $62 billion, making it the most valuable publicly traded AI-only company in China and, by one industry estimate that predates the listing, the country's third-largest player in the market for business-facing large language models. [2]
GLM models push the open-weights frontier
Zhipu's GLM line runs back to GLM-10B in 2021 and the bilingual GLM-130B in 2022, well before the current wave of open-weight releases out of Chinese labs. By June 2026 the GLM-5 series had taken the top spot on an independent open-weights benchmark, and by one security vendor's own testing it had moved ahead of Anthropic's Claude models on cyber tasks. [1][4][5]
Licensing tightened as the models got more capable. GLM-5.1 in April 2026 and the smaller GLM-5.3-Flash both shipped under a plain MIT license, but when the GLM-5.3 flagship's weights followed two weeks after its API debut, the license required large commercial operators to clear a Z.ai security review first: downloadable, but not unconditionally so. [3][8][9]
Post-training as the new lever
GLM-5.3 in August 2026 kept the same 743 billion parameter base as its predecessor and found its gains entirely in post-training, reporting the lab's strongest coding results to date and 84.5 percent on the CyberGym security benchmark, ahead of Anthropic's Mythos 5 and OpenAI's GPT-5.6 Sol by Zhipu's own account. [6][7]
The model that became GLM-5.3-Flash had already been running for a week under a different name, "Ox Alpha," before Z.ai confirmed it had built the thing, a stealth launch ahead of the formal release. [8]
Sources
- Z.ai - Inspiring AGI to Benefit Humanity
Z.ai
- Zhipu AI
Wikipedia · Sep 9, 2026
- zai-org/GLM-5.1
Z.ai · Apr 7, 2026
- GLM-5.2 is the new leading open weights model on the Artificial Analysis Intelligence Index
Artificial Analysis · Jun 16, 2026
- GLM 5.2 beats Claude in our cyber benchmarks
Semgrep · Jun 28, 2026
- Z.ai debuts GLM-5.3 with long-horizon coding, cybersecurity upgrades
SiliconANGLE · Aug 14, 2026
- Z.ai Ships GLM-5.3 Without Retraining the Base Model: Better at Complex Coding and Long-Horizon Tasks
MarkTechPost · Aug 14, 2026
- GLM-5.3-Flash: Frontier Intelligence, Flash Cost
Z.ai · Aug 26, 2026
- zai-org/GLM-5.3
Z.ai · Aug 28, 2026