Oklo Inc. is an American company that designs and develops advanced nuclear reactors based in Santa Clara, California. 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 to "avoid a conflict of interest ahead of talks between his company and the nuclear start-up on an energy supply agreement." 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. Oklo's business model is aimed at developing, building, and operating fast-fission power plants to sell power to customers, and its main product line for producing power is the Aurora nuclear reactor. The Aurora powerhouse is a design for a small power plant to generate 15-75 MWe of electrical power using a fast neutron reactor to produce heat. Around 20 fast reactors have been tested since the 1950s, with over 400 reactor-years of cumulative operating experience. Wikipedia