"...Annie has made deeply hurtful and entirely untrue claims about our family, especially Sam," the boss of the California startup said in a letter co-signed by his mother and two brothers, and published on social platform X.

"Our family loves Annie and is very concerned about her well-being. Caring for a family member who faces mental health challenges is incredibly difficult," they wrote.

One of Silicon Valley's more charismatic figures, Altman shot to global fame with the launch of ChatGPT in 2022, which ignited a race to advance AI research and development.

A prolific entrepreneur and already a billionaire, Altman, 39, has set himself the mission of developing a so-called "general" AI, with cognitive abilities similar to those of humans and which "benefits all of humanity".

The Altman family said that they have tried to help their daughter and sister, covering her expenses and guaranteeing her "monthly financial support, which we expect to continue for the rest of her life".

"Despite this, Annie continues to demand more money from us," they said, pointing out that they have decided to respond publicly following Anne's legal complaint filed on Monday, and after years of tension.

"The worst allegation she has made is that she was sexually abused by Sam as a child," said the family.

"Her claims have evolved drastically over time. Newly for this lawsuit, they now include allegations of incidents where Sam was over 18.

"All these claims are utterly untrue."

According to the complaint, Annie -- who is nine years younger than Sam Altman -- alleges the assaults took place from 1997, when she was three, until 2006.

In a report for New York Magazine in 2023, a journalist who met Annie in Hawaii described her as an artist suffering from depression and the growing rift with her family, and supporting herself mainly through online sex work.

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