Oklo Inc. is a designer of Small Modular Reactors based in Santa Clara, California. Founded in 2013 by Jacob and Caroline DeWitte, Oklo Inc. focuses on fast reactor, SMR plants. OpenAI co-founder Sam Altman served as an early CEO, 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 selling power to customers, and its main product line for producing power is the Aurora nuclear reactor powerhouse product line. The Aurora powerhouse is a design for a small power plant to generate 15-50 MWe of electrical power via a Siemens or similar power generation system and utilizing a compact fast neutron reactor to produce heat. Around 20 fast reactors were first tested in the 1950s, with mixed results. Fast reactors have demonstrated several safety benefits over thermal-neutron reactors. Wikipedia