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Fact·f_hK4fG5hI6j·Fact·Holden Karnofsky

Holden Karnofsky — Notable For: Co-founder of GiveWell and Open Philanthropy; influential figure in effective altruism; author of 'Most Important Century' blog series on transformative AI

Verdictpartial85%
1 check · 4/20/2026

The source confirms two of the three main claims: co-founding GiveWell and Open Philanthropy (explicitly stated in the infobox), and being an influential figure in effective altruism (confirmed in the Views section and EA key figures list). However, the source does not mention the 'Most Important Century' blog series on transformative AI. The source does mention he has written about AI safety and joined Anthropic to work on AI safety, but does not specifically reference this blog series. This makes the claim partially confirmed rather than fully confirmed.

Our claim

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Subject
Holden Karnofsky
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Notable For
Value
Co-founder of GiveWell and Open Philanthropy; influential figure in effective altruism; author of 'Most Important Century' blog series on transformative AI

Source evidence

1 src · 1 check
partial85%primaryHaiku 4.5 · 4/20/2026

NoteThe source confirms two of the three main claims: co-founding GiveWell and Open Philanthropy (explicitly stated in the infobox), and being an influential figure in effective altruism (confirmed in the Views section and EA key figures list). However, the source does not mention the 'Most Important Century' blog series on transformative AI. The source does mention he has written about AI safety and joined Anthropic to work on AI safety, but does not specifically reference this blog series. This makes the claim partially confirmed rather than fully confirmed.

Case № f_hK4fG5hI6jFiled 4/20/2026Confidence 85%