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Sylvian
InactiveSpecialized AI Agents.
Fall 2025Founded 20252 peopleSan Francisco, CA, USA
About
Sylvian helps companies build specialized AI agents.
Founders ยท 2
William HuangFounder
CEO @ Sylvian. IPhO Gold, Ex-Waymo, Citadel Securities, Stanford CS.
Niall KehoeFounder
CTO @ Sylvian. Ex-Stanford CS, Two Sigma, Harvard Medical School / Stanford research
Launch
Launched on Y Combinator ยท Nov 2025
View launch post โSylvian incentivizes high quality expert data for LLMs through Competition
Sylvian hosts competitions to collect expert data for LLMs, starting with tool-use data (e.g., Excel, VSCode). It crowdsources 4,500+ experts to produce high-quality data at scale, marketing the thrill of leaderboard positions and competition prestige as the core value for data collection.
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