China Stock of the Day | Kabutaro & Friends

Z.AI<02513.HK>, a leading large language model company, was the Chinese stock most talked about online on August 21, 2026.
Background: On this day, China's National Supercomputing Internet announced it had launched an API service for the company's new-generation foundation model, GLM-5.3, allowing enterprises and developers to call the model directly without complex environment setup. Boosted by this news, the stock extended gains into the Hong Kong market's close, rising 10.36% to close at HKD 1,023, with market capitalization reaching HKD 526.114 billion. Fellow large-model stock MiniMax<MINIMAX-W> also rallied in sympathy, at one point up more than 14% intraday before closing up 11.86%, with a market cap of HKD 121.3 billion. The sharp late-session surge in both stocks stood out within the broader Hong Kong market and drew heavy online attention.