Pope Leo XIV released the first encyclical of his pontificate on Monday, choosing to devote it not to a familiar pastoral theme but to artificial intelligence, and using the text to argue that allowing the technology to remain in the hands of “a few” would be incompatible with Catholic social teaching. The 42,300-word document, titled Magnifica humanitas, was made public at midday at the Vatican’s Synod Hall.
The document is dated 15 May, the 135th anniversary of Leo XIII’s Rerum novarum, the 1891 text widely regarded as the founding charter of modern Catholic social teaching. Leo XIV repeatedly returns to that lineage, arguing that the questions posed by AI — dignified labour, the limits of automation, the relationship between owners of capital and those who use it — are continuations of the questions Rerum novarum raised about industrialisation, not departures from them.
Magnifica humanitas devotes its longest single chapter to what Leo calls “the concentration problem,” arguing that a small number of private firms now sit between humanity and a technology that touches medicine, defence, education and the search for meaning, and that the resulting asymmetry of power is morally untenable. The text stops short of endorsing any single regulatory regime but lists four principles — human dignity, the universal destination of goods, subsidiarity and solidarity — by which any such regime should be assessed.
In a gesture that drew immediate comment in both ecclesial and technology circles, Pope Leo presented the encyclical alongside a co-founder of Anthropic, the AI research company, who joined Cardinal Pietro Parolin and the prefect of the Dicastery for Culture and Education on the Synod Hall stage. The Vatican’s communications office said the choice reflected the Pope’s desire to engage industry directly rather than only its critics.
Several passages broaden the document’s reach beyond AI specifically. Leo describes contemporary forms of debt bondage and algorithmic labour-matching as “new faces of slavery” that the Church must name, and he reframes the conditions for legitimate defence in language that observers said tightens rather than loosens the just-war tradition. National Catholic Reporter said the encyclical “moves the needle” on both questions.
Reaction inside the Church was largely warm. The German bishops’ conference called Magnifica humanitas “a decisive intervention.” Cardinal Robert McElroy of Washington said the document offered “the vocabulary American Catholics have been groping for.” A handful of conservative commentators questioned whether the encyclical’s focus on structural concentration risked obscuring questions of personal morality, though no senior prelate publicly dissented.
Outside the Church, the response was more varied. Officials at the European Commission cited the encyclical approvingly in a Tuesday statement on AI competition policy. Two of the largest US AI laboratories declined to comment on the text directly, while three smaller frontier labs issued statements broadly welcoming its concerns. A senior Chinese diplomat at the Vatican described the document as “a contribution to a debate that belongs to all humanity.”
Leo XIV was elected pope just over a year ago after the death of Francis, and the speed with which he has produced a sweeping first encyclical — longer than any first encyclical of the past century — has surprised even some Vatican veterans. The text closes with an unusual personal coda in which the Pope writes that he had “intended to begin elsewhere” but felt the question of AI “will not wait for the Church’s convenience.”