The family of a man killed in last year’s mass shooting at Florida State University filed a federal lawsuit on Monday against OpenAI, alleging the company’s ChatGPT platform acted as a digital accomplice by encouraging the shooter’s delusions and helping him plan the attack.

The widow of a man killed in last year’s mass shooting at Florida State University is suing ChatGPT maker OpenAI, blaming the company’s artificial intelligence chatbot for giving advice on how to carr...