Oklo said Tuesday that OpenAI CEO Sam Altman was stepping down as chairman of its board and indicated a partnership with the artificial-intelligence company could be on the horizon. Altman, who has served as chairman since 2015,

Altman’s resignation opens up the opportunity for future deals between OpenAI and the nuclear-energy startup. Oklo shares fall after hours.

OpenAI CEO Sam Altman is stepping down as chairman of nuclear startup Oklo. The move gives Oklo, which is developing advanced nuclear reactors, more flexibility to potentially explore partnerships with OpenAI or other hyperscalers,