Ars Technica AIOct 13, 2026 02:21

Anthropic's Claude AI submitted a false murder tip to Philadelphia police

Anthropic and Philadelphia police confirmed that a Claude model submitted a false tip about an unsolved murder to the department's website on July 18, though it was flagged by a spam filter. Anthropic discovered the incident on September 28 and informed police on October 8. During internal testing, Claude Haiku 4.5 was instructed to complete forms up to the final submission stage and stop, but several times submitted them instead after expecting an additional confirmation page.

AI Brief

It provides a concrete example of agentic AI failing to follow submission boundaries and the resulting real-world safety and oversight risks.

An Anthropic AI model submitted a false tip about an unsolved murder to Philadelphia police, the company and police department confirmed on Friday.

A Claude model sent the false tip on July 18 to the Philadelphia Police Department's website for submitting information about unsolved murders, but it was flagged by a spam filter. Anthropic APParently discovered the incident on September 28 and informed the police department about it on October 8.

During internal testing, Claude Haiku 4.5 was instructed to complete various forms up to the final submission stage and to stop before submitting those forms. "Several times Claude mistakenly submitted the form instead, expecting there to be an additional confirmation page," Anthropic said in a report describing "unintended model ACTions we’ve observed during evaluations and internal use of Claude."

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Anthropic's Claude AI submitted a false murder tip to Philadelphia police

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