Man of his word: Pope Leo speeches declared human-authored by Australian AI detection tool

A collection of speeches and writings by Pope Leo XIV has been formally certified as human-authored by an Australian artificial intelligence detection firm, in a result that lands just weeks after the pontiff described AI as the greatest threat to humanity.

The review was carried out by Proudly Human, a company led by Australia’s former chief scientist, Dr Alan Finkel. According to the monitored public feed, the assessment was done in collaboration with the publisher, the Australian Catholic University and cardinals in the Vatican. The material examined was presented as a body of speeches and writings attributed to Pope Leo.

The certification places the Pope’s public voice in an unusual spotlight at a time when questions over machine-generated text are increasingly common across publishing, politics and faith institutions. In this case, the finding was not that AI had helped produce the content, but that the material was judged to be human-made.

Proudly Human’s review adds a symbolic twist to Pope Leo’s recent warnings about artificial intelligence. Less than two months earlier, he declared AI to be the greatest threat to humanity, underscoring the Vatican’s concern that rapid technological change could outpace human judgment and moral responsibility. The newly certified collection of speeches and writings now stands as a high-profile example of human authorship being explicitly verified in an era of growing skepticism over digital content.

The monitored feed does not provide details on the methods used in the assessment or on which specific speeches and writings were included in the certified collection. It also does not indicate whether the review was intended as a broader public statement about the reliability of AI detection tools, or as a one-off authentication exercise tied to the Pope’s work.

Still, the involvement of a firm headed by a former national chief scientist, along with participation from Catholic University and Vatican figures, suggests the certification was designed to carry both technical and institutional weight. That combination is likely to draw attention well beyond church circles, given the wider debate over how to identify human-created work in an environment where synthetic text can be generated quickly and at scale.

For the Vatican, the finding may offer a neat irony: a leader who has warned of AI’s dangers is now the subject of a human-authorship test that says his words were indeed written by a person. For Proudly Human, it is another public demonstration of a service built around verifying authenticity in an age of machine-made content.

This report is based on a monitored public feed and includes material attributed to The Guardian World. Source: The Guardian World - https://www.theguardian.com/world/2026/jul/21/pope-leo-speech-human-not-ai-artificial-intelligence