Oklo Inc. is a designer of advanced nuclear reactors based in Santa Clara, California.[1][2] Founded in 2013 by Jacob and Caroline DeWitte, Oklo Inc. focuses on fast-fission power plants. OpenAI co-founder Sam Altman served as Chairman of the Board of Directors, but stepped down in April 2025[3] to "avoid a conflict of interest ahead of talks between his company and the nuclear start-up on an energy supply agreement."[4][5]
The company's name is derived from Oklo, a region in the country of Gabon, Africa where self-sustaining nuclear fission reactions occurred approximately 1.7 billion years ago.[6]