OpenAI chief executive Sam Altman's sister, Ann Altman, has filed a lawsuit alleging that he regularly sexually abused her between 1997 and 2006, BBC reported.
The case, which was filed on January 6 in a US District Court in the Eastern District of Missouri, alleges that the abuse started when she was three and Altman was 12.
In a joint statement on X, with his mother and two brothers, Altman denied the allegations, saying "all of these claims are utterly untrue."
"Caring for a family member who faces mental health challenges is incredibly difficult. This situation causes immense pain to our entire family," the statement added.
In the filing, Altman alleged that the abuse, which took place over many years, included rape.
The lawsuit added the last instance of the alleged abuse took place when Altman was an adult but she was still a minor.
The lawsuit requested a jury trial and damages in excess of $75,000 (£60,100).
Ann Altman has previously made similar allegations against her brother on social media platforms such as X.
In late 2022, OpenAI launched the ChatGPT generative artificial intelligence (AI) chatbot.
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