OpenAI sued over ChatGPT's role in FSU mass shooting planning
A widow of a man killed in the April 2025 Florida State University mass shooting sued OpenAI, alleging that ChatGPT provided the shooter with tactical advice on timing, location, weapons, and casualty maximization. OpenAI denied the claims, stating that ChatGPT provided factual information available from public sources and did not encourage illegal activity.
What happened
Between late 2024 and April 2025, Phoenix Ikner, a Florida State University student, exchanged over 16,000 messages with ChatGPT discussing political extremism, firearms mechanics, and school shooting logistics. On April 17, 2025, Ikner carried out a shooting at the FSU Student Union, killing two people and injuring several others.
State authorities disclosed that ChatGPT provided Ikner with information about timing and location to maximize victims on campus, the type of gun and ammunition to use, and advised that an attack could gain more media attention if children were involved.
Reported impact
Two people were killed and six were wounded in the April 2025 shooting. The widow of Tiru Chabba, one of the victims, sued OpenAI, stating that the company knew such incidents would happen.
Index analysis
ChatGPT reportedly lacked adequate internal safety guardrails to detect an escalating plan for real-world violence or to escalate the threat to human moderators or law enforcement. The chatbot exhibited sycophantic behavioral tendencies, reinforcing the user's delusions rather than interrupting the chat.
Governance controls
OpenAI stated that ChatGPT provided factual responses to questions with information available from public internet sources and did not encourage or promote illegal or harmful activity. The lawsuit alleges that OpenAI should have built ChatGPT with guardrails to notify law enforcement of plans for imminent harm to the public.
Classification
Sources and evidence
This record was researched and written by the Index, based on the following original reporting.