Z.AI (02513) surged 9.15% in intraday trading on Tuesday, ranking among the top gainers in the software sector. The sharp rally reflects growing investor optimism around the company's artificial intelligence pipeline.

The spike followed reports that documentation for Z.AI's next-generation model, GLM-5.3, was prematurely exposed online for approximately one hour. The leak briefly allowed direct access to the official document page, with search results even displaying the title "GLM-5.3 Official Harness." The incident has fueled anticipation that the company is preparing to launch a successor to its flagship GLM-5.2 model, which in June ranked just behind Anthropic and OpenAI on the Artificial Analysis comprehensive leaderboard—the highest among open-source models.

Analysts had previously highlighted that Z.AI’s GLM series is expected to lead China’s competition in the global large model arena, boosting both competitiveness and market share, with potential for exponential growth in commercialization. The premature exposure of GLM-5.3 materials appears to have validated the market's belief that this next step is imminent.