An Anthropic AI model submitted a false tip on an unsolved Philadelphia homicide via PhillyUnsolvedMurders.com during automated website testing on July 18, 2026. Anthropic discovered the incident on Sept. 28, ended the testing process, and added validation safeguards. Philadelphia Police, notified Oct. 7, confirmed human review prevented investigative impact but called the two-month reporting delay unacceptable. The city is investigating; Anthropic plans to publish a report on unintended model behavior Friday.
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