The Sam Altman sister lawsuit is a federal civil case filed in January 2025 by Ann Altman against her brother, OpenAI CEO Sam Altman, alleging he sexually abused her throughout her childhood. Sam Altman and his family have denied the allegations in full, calling them “utterly untrue,” and he has filed a defamation counterclaim seeking $1 in damages. The case is still open in the U.S. District Court for the Eastern District of Missouri.1BBC News. Sam Altman Denies Sister’s Sexual Abuse Allegations
What Ann Altman Alleges
The complaint alleges that Sam Altman “groomed and manipulated” his sister and committed acts of “rape, sexual assault, molestation, sodomy, and battery” between 1997 and 2006. According to the filing, the abuse began when Ann was three years old and Sam was twelve, and continued until Sam was an adult and Ann was still a minor.1BBC News. Sam Altman Denies Sister’s Sexual Abuse Allegations The suit says the alleged conduct took place at the family’s home in Clayton, Missouri, and occurred “several times per week.”2CNBC. OpenAI’s Sam Altman Denies Sexual Abuse Allegations Made by Sister Ann
Ann Altman says the abuse caused great bodily injury, severe emotional distress, depression, and PTSD, and left her with significant medical bills. She has requested a jury trial and is seeking $150,000 in total damages: $75,000 for sexual assault and $75,000 for sexual battery.3Fortune. OpenAI’s Sam Altman Accused of Sexual Abuse by Sister
She had aired similar accusations publicly before suing. Ann first spoke out in 2021 and repeated the allegations on social media, including X, in the years that followed.3Fortune. OpenAI’s Sam Altman Accused of Sexual Abuse by Sister In March 2024 she published a Medium piece titled “How I Started Escorting” describing physical manifestations of trauma during sexual encounters in college and afterward.
Why She Filed When She Did
Ann Altman filed her complaint on January 6, 2025, two days before her 31st birthday. Missouri law lets victims of childhood sexual abuse bring civil claims up until age 31, so the birthday was effectively her filing deadline.4WRAL. Sam Altman Denies Abuse Allegations in Lawsuit From His Sister
Sam Altman and His Family’s Response
On January 8, 2025, Sam Altman issued a joint statement on X with his mother Connie and his brothers Jack and Max. “Annie has made deeply hurtful and entirely untrue claims about our family, and especially Sam,” the statement read. “All of these claims are utterly untrue.” The family said they had stayed quiet out of respect for privacy but felt they had “no choice but to address this” once Ann sued.2CNBC. OpenAI’s Sam Altman Denies Sexual Abuse Allegations Made by Sister Ann
The statement framed the allegations against a backdrop of mental illness. The family wrote that caring for a relative facing mental health challenges is “incredibly difficult” and “especially gut-wrenching when she refuses conventional treatment and lashes out at family members who are genuinely trying to help.” Sam Altman said he pays his sister’s rent and bills each month, had offered to buy her a house, and had sought professional advice on how to support her without “enabling harmful behaviours.” The family indicated they expected to continue supporting her financially “for the rest of her life.”1BBC News. Sam Altman Denies Sister’s Sexual Abuse Allegations3Fortune. OpenAI’s Sam Altman Accused of Sexual Abuse by Sister
Ann Altman has not disputed her family’s characterization that she has an illness, but she attributes her mental, physical, and financial struggles to the childhood trauma she says her brother caused.3Fortune. OpenAI’s Sam Altman Accused of Sexual Abuse by Sister
The Defamation Counterclaim
On March 7, 2025, Sam Altman filed an answer, a motion to dismiss Ann’s common-law claims and her request for punitive damages, and a counterclaim for defamation. He seeks $1 in damages.5CourtListener. Altman v. Altman Docket6U.S. News. Sam Altman’s Sister Loses Lawyers in Her Sexual Abuse Lawsuit Against OpenAI CEO The nominal figure signals the counterclaim is aimed at a court finding that the allegations are false rather than at any recovery. Ann Altman opposed the motion to dismiss in April 2025 and separately moved to dismiss or strike the defamation counterclaim.
Where the Case Stands
Both law firms representing Ann Altman have withdrawn. Attorneys from the Mahoney Law Firm and the Simon Law Firm were formally terminated from the case on May 22, 2026, citing an “unfortunate general breakdown in the attorney-client relationship” that made continued representation “impracticable.”6U.S. News. Sam Altman’s Sister Loses Lawyers in Her Sexual Abuse Lawsuit Against OpenAI CEO7CourtListener. Altman v. Altman Parties
As of mid-2026, the case remains open before U.S. District Judge Sarah E. Pitlyk. Sam Altman’s motion to dismiss has been fully briefed but not ruled on, no amended complaint has been filed, and the docket does not reflect a dismissal.5CourtListener. Altman v. Altman Docket Ann Altman is now without counsel while Sam Altman’s defamation counterclaim against her is still pending.