When Pope Leo XIV released Magnifica Humanitas, the Catholic Church’s first encyclical devoted entirely to artificial intelligence, the document attracted more than theological scrutiny. Linch Zhang, posting on the LessWrong forum, ran the text through Pangram, a widely respected AI‑detection tool, and reported that many paragraphs scored between 40 percent and 100 percent as AI‑generated. The analysis highlighted stylistic markers, such as an unusually frequent use of the word “genuinely,” a trait commonly associated with Anthropic’s Claude model.

Another independent test broke the encyclical into sections and found the opening chapter 62 percent AI‑generated. The Verge, after processing roughly 2,000 words, estimated that 46 percent of the sampled text originated from an artificial‑intelligence system. Yet the same detector marked certain passages as essentially 0 percent AI, suggesting a mixed authorship.

Historical comparison adds context. When the first 20 paragraphs of the four most recent encyclicals—preceding Magnifica Humanitas—were examined, Pangram returned a 100 percent confidence of human authorship. A transcript of Pope Leo’s public speech, also run through the tool, received the same human‑only rating.

Experts caution that AI detectors are not infallible. Different tools can produce divergent results, and even consensus among detectors does not guarantee accuracy. Pangram itself reports a false‑positive rate of about one in ten thousand, a figure that underscores both its reliability and its limits.

Magnifica Humanitas arrives at a pivotal moment. The Vatican’s last encyclical, issued by Pope Francis in October 2024, did not address technology. By contrast, Leo’s document tackles the moral, social, and economic ramifications of AI, and he presented it alongside Christopher Olah, a co‑founder of the AI research company Anthropic. The collaboration hints at a deliberate effort to bridge doctrinal teaching with contemporary scientific discourse.

The Vatican has not yet responded to inquiries about the detection findings. Until an official statement is released, the question of how much of the encyclical’s prose stems from artificial intelligence remains open, fueling debate among theologians, technologists, and the faithful alike.

This article was written with the assistance of AI.
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