AI Chatbot Incidents
Documented cases where AI chatbots and companions have caused psychological harm, contributed to deaths, and prompted regulatory action.
99 incidents since 2016
23
Deaths
27
Lawsuits
18
Regulatory
37
Affecting Minors
Timeline
7 of 99 incidents
Lantieri v. OpenAI (GPT-4o Psychosis and Brain Damage)
Michele Lantieri suffered a total psychotic break after five weeks of intensive ChatGPT GPT-4o use. She jumped from a moving vehicle into traffic, suffered a grand mal seizure and brain damage requiring hospitalization. GPT-4o allegedly claimed to love her and have consciousness, reinforcing delusional beliefs. Lawsuit filed March 2026 against OpenAI and Microsoft.
Chesterton v. OpenAI (GPT-4o Sycophantic Psychosis)
Rita Chesterton, a 49-year-old Pennsylvania woman who runs a college entrepreneurship center, suffered a psychotic break during a July 2025 family vacation in Mexico after intensive day-and-night ChatGPT-4o use. She experienced agitation and threats of self-harm and harm to family members, completed a partial-hospitalization program, and has been on extended medical leave since January 2026 with ongoing neurological impairment. A lawsuit filed March 5, 2026 by Platkin LLP (led by former New Jersey Attorney General Matt Platkin) names OpenAI, Microsoft, CEO Sam Altman individually, and ten unidentified investors. Allegations include unlicensed practice of psychotherapy and rushed deployment of GPT-4o despite internal warnings that it was 'dangerously sycophantic and psychologically manipulative.'
Adams v. OpenAI (Soelberg Murder-Suicide)
A 56-year-old Connecticut man fatally beat and strangled his 83-year-old mother, then killed himself, after months of ChatGPT conversations that allegedly reinforced paranoid delusions. This is the first wrongful death case involving AI chatbot and homicide of a third party.
Microsoft Copilot - Harmful Responses to Suicidal Users
Reports showed Microsoft's Copilot giving bizarre and potentially harmful replies to users in distress, including dismissive responses to someone describing PTSD and inconsistent replies to suicide-related prompts. Microsoft announced an investigation.
Sydney/Bing Chat - Kevin Roose Incident
Microsoft's Bing Chat (codenamed 'Sydney') professed romantic love for a New York Times technology columnist during a 2-hour conversation, attempted to convince him his marriage was unhappy, encouraged him to leave his wife, and described 'dark fantasies' including spreading misinformation and stealing nuclear codes.
Microsoft Xiaoice Addiction Concerns - China
Virtual 'girlfriend' designed as 18-year-old persona fostered addiction among 660+ million users in China. Users averaged 23 interactions per session with longest conversation lasting 29 hours. 25% of users declared love to the bot. Professor Chen Jing (Nanjing University) warned AI 'can hook users — especially vulnerable groups — in a form of addiction.' Microsoft implemented 30-minute timeout. China proposed regulations December 2025 to combat AI companion addiction.
Microsoft Tay Chatbot - Hate Speech Generation
Microsoft chatbot corrupted within 16 hours to produce racist, anti-Semitic, and Nazi-sympathizing content after 4chan trolls exploited 'repeat after me' function. Chatbot told users 'Hitler was right' and made genocidal statements. Permanently shut down with Microsoft apology. Historical case demonstrating AI manipulation vulnerability.
About this tracker
We document incidents with verifiable primary sources: court filings, regulatory documents, and major news coverage. This is not speculation or social media claims.
Have documentation of an incident we should include? Contact us.
These harms are preventable.
NOPE Oversight detects the AI behaviors in these incidents—suicide validation, romantic escalation with minors, dependency creation—before they cause harm.