A tracker counts 105 ex-YC founders now inside OpenAI and Anthropic

A single-page site, joinedanthropic.com, compiles a running list of Y Combinator alumni who have gone on to work at the two leading frontier-AI labs. As of its July 14, 2026 update, the tracker names at least 105 former YC founders employed at OpenAI or Anthropic, presented as a browsable table of who they are and what they previously built.

The underlying signal is a talent migration: people who once raised money to start their own companies are increasingly choosing to join a handful of dominant AI organizations rather than keep running or founding startups. That concentration of experienced, YC-vetted operators inside OpenAI and Anthropic hints at where ambitious builders now see the most leverage — and, implicitly, at the startups that stalled or shut down along the way.

The page itself is thin on analysis beyond the count and the directory, and it doubles as a cross-promotion for Startups.RIP, a database of failed startups pitched as a source of validated ideas worth retrying. Treat the 105 figure as a lower-bound tally from an informal, self-published tracker rather than an audited dataset.