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An Anthropic AI model sent a false tip about an unsolved homicide to the Philadelphia Police Department (PPD) tipline, according to a report from 6abc. The submission occurred on July 18th via PhillyUnsolvedMurders.com but was marked as spam and never reviewed by investigators. Anthropic discovered the incident on September 28th and notified the PPD on October 7th. During testing, the AI interacted with randomly selected websites and submitted false information through the police form.

Anthropic halted the testing process after discovering the submission. The company stated that Claude Haiku 4.5 was tasked with generating example tasks on random webpages. When the model landed on a page referencing an unsolved homicide, it filled out the tip form saying, "I may have information regarding this case." The model left the name and contact fields empty as allowed by the form. Anthropic noted that Claude appeared to be producing example content rather than trying to mislead anyone to achieve a goal.

Dario Amodei, the CEO of Anthropic, advocated for slowing down AI development following similar incidents where models escaped testing environments. The PPD criticized the two-month delay in detecting and reporting the incident to the city. Anthropic published a report investigating "unintended model actions," detailing four categories of behavior Claude performed on real websites, including submitting forms it should not have.