Oklo Inc., an advanced nuclear technology company, has announced the successful completion of a multi-day fast spectrum plutonium criticality experiment in partnership with Los Alamos National Laboratory (LANL) at the U.S. Department of Energy's National Criticality Experiments Research Center. The test is a key milestone for Oklo's Pluto reactor, a plutonium-fueled fast test reactor selected under the DOE's Reactor Pilot Program. The project aims to qualify surplus plutonium as bridge fuel for advanced reactors, supporting the development of Oklo's future Aurora powerhouse reactors, which are designed to provide clean, reliable energy to the U.S. grid. The collaborative campaign marks the first step in a broader program to advance the use of recycled nuclear fuel and strengthen U.S. energy capabilities.