William Du
杜知恒
William Du (杜知恒) is the co-founder and CEO of Xiaosu Technology (小宿科技), an AI startup building what he calls an "information superhighway" for the agent era . He joined Baidu in 2013 as part of its mobile-cloud PMO team, working on Baidu Mobile Assistant and mobile search strategy before pivoting to investing . After leaving Baidu, he spent a decade in hedge funds—first at Hillhouse managing global gaming and entertainment investments, then co-founding Sequoia China's hedge fund—where he developed an interest in infrastructure and began tracking AI's impact . He describes his move from investor to founder as driven partly by temperament; as his longtime acquaintance Chen Yu of Yunqi Capital put it, Du was "sharp" from their first meeting over a decade ago and has since "steadied considerably" . His current bet, articulated in a May 2026 interview, is that search is an order of magnitude cheaper than reasoning—though he estimates 90% of people haven't recognized this yet .
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Coverage
"Xiaosu Tech" Du Zhiheng: Search Is 10x Cheaper Than Reasoning, But 90% of People Don't Know | Yunqi Portfolio --- This is a headline/article title, so here's the full translation with context: **"Xiaosu Tech" Du Zhiheng: Search Is 10x Cheaper Than Reasoning, But 90% of People Don't Know | Yunqi Portfolio** Or if you need the body text translated as well, please provide it.
How to Spend Your Tokens Without Regret
From Hedge Fund to AI Startup Frontlines: A Conversation with Du Zhiheng on Rebuilding the "Information Superhighway" for Agents | Yunqi Capital Attent!on Podcast
**The "last mile" of search engines is being rebuilt.**
Vol.09 How Should Search Engines Work in the Agent Era? A Conversation with Yu Chen and Zhiheng Du on AI "New Infrastructure"
An Agent Infra Founder with $25M ARR Says: We're at 6:05 AM on Day One of the Agent Era | A Conversation with Xiaosu Technology's William Du
