Pope Leo XIV's First Encyclical Calls AI 'Moral Test' of the Age

Pope Leo XIV released his first encyclical, Magnifica Humanitas ("Magnificent Humanity"), on May 25, 2026 — a 235-page document devoted entirely to artificial intelligence and what it means for human dignity. In an unusual gesture, the pope presented the encyclical himself at the Vatican alongside Christopher Olah, a co-founder of Anthropic and one of the world's most cited AI safety researchers.

It is the first papal encyclical in history dedicated to a single technology. And it lands with the highest binding force any pope can give a teaching document.

A Letter Aimed Squarely at the AI Industry

Encyclicals are the highest-authority pastoral letters a pope can issue. They are written for bishops worldwide but carry weight across Catholic institutions, governments, and civil society. Magnifica Humanitas is Leo's first, signed on May 15 — exactly 135 years after Pope Leo XIII signed Rerum Novarum, the foundational 1891 encyclical on workers' rights and industrial capitalism.

The choice of date is not subtle. Leo XIV is positioning AI as this generation's version of the industrial revolution: an epochal shift that requires the church to weigh in before the moral framework is set by markets alone.

"Without bold decisions, the prospect of greater poverty and inequality looms large, which would leave many individuals marginalized, stranded and surrounded by the machines and automated systems that have replaced them," the encyclical reads.

The document warns AI risks widening inequality, weakening democracy, hollowing out the middle class, fueling social fragmentation, and normalizing AI-driven warfare. Leo explicitly labels unchecked AI-driven military systems as violating Catholic "just war" doctrine, writing that "military force can only be justified for self-defense in the strictest sense."

Why Anthropic's Co-Founder Was Standing Next to the Pope

The choice of Christopher Olah as the presenter alongside Leo is significant. Olah is not a Vatican adviser or a Catholic theologian. He is one of the founders of Anthropic, the AI lab whose work on interpretability — understanding how AI systems actually think — has become central to industry safety conversations. Anthropic has also been the most public frontier lab in saying it will refuse certain military contracts, a position that recently cost it a Pentagon classified-systems deal.

Olah did not deliver a corporate pitch. His remarks were closer to a public confession.

"Every frontier AI lab, including my own, operates inside a set of incentives and constraints that can sometimes conflict with doing the right thing," he told the audience. He acknowledged that his presence there "may sound strange coming from the co-founder of an AI company."

His central plea was that the technology industry needs outside accountability it cannot generate from within. "We need more of the world — religious communities, civil society, scholars, governments — to do what His Holiness has done here: to take this seriously, to look closely, and to push events in a better direction," Olah said. He added that the labs need "informed critics who will tell the labs when we are failing" and "moral voices that the incentives cannot bend."

He closed with a direct request for an ongoing partnership: "Today is just the beginning, the start of a long collaboration between those of us who are building this and those who can see what we, from inside, cannot."

Why This Matters Beyond Catholicism

Encyclicals are formally addressed to Catholics, but their influence travels well beyond the church. Rerum Novarum in 1891 shaped a century of labor law, social democracy, and Catholic social teaching across more than 60 countries. UN agencies, EU policymakers, and Latin American governments routinely cite papal encyclicals in policy debates.

Magnifica Humanitas arrives at a moment when AI governance is still being written. The EU AI Act is in implementation, the US has the Trump administration's voluntary disclosure framework, and most of Asia is improvising. A 235-page document from the world's largest faith institution — one that explicitly calls for "disarming" military AI and binding regulation on labor displacement — is going to be cited in every one of those debates.

It also gives political cover to AI safety advocates inside the labs themselves. When the Pope frames AI as "the defining moral test of the modern age," it becomes harder for boards to dismiss safety teams pushing back on shipping speed.

Industry Reaction

The response inside the AI industry has been notably respectful, even from labs that disagree with the encyclical's framing. The fact that Anthropic's Olah co-presented is a signal: at least one of the major labs sees alignment with the church's concerns as strategically useful, not as a constraint.

Pope Leo's framing is also unusually specific. Magnifica Humanitas names concentration of AI power as a primary risk and calls for "global moral oversight." Olah amplified the same point at the Vatican: "How can we ensure the gains of AI are shared globally? We do not have a mechanism for this."

That is the same critique heard from open-source advocates, antitrust regulators, and labor unions. Leo has just put the moral weight of the papacy behind it.

What's Next

The full text of Magnifica Humanitas is now available through the Vatican. Expect citations in EU Commission documents, US congressional hearings, and corporate AI governance frameworks within weeks. Catholic universities and hospitals — among the largest non-government employers in many countries — will begin updating their AI usage policies in response.

For the AI labs themselves, the immediate question is whether other frontier players follow Anthropic's lead in engaging directly with the church and other civil-society institutions. OpenAI, Google DeepMind, and xAI did not have representatives at the Vatican event.

Bottom Line

A papal encyclical dedicated entirely to AI, presented jointly with an Anthropic co-founder, marks a turning point in how the technology is talked about. The conversation is no longer just about capability and competition — it has been formally pulled into the domain of moral teaching. For an industry that has spent two years arguing safety is a technical problem, Magnifica Humanitas is a reminder that it is also a public, ethical, and political one.