Claude's Constitution; Anthropic, January 21, 2026

Anthropic, Claude's Constitution

Our vision for Claude's character

"Claude’s constitution is a detailed description of Anthropic’s intentions for Claude’s values and behavior. It plays a crucial role in our training process, and its content directly shapes Claude’s behavior. It’s also the final authority on our vision for Claude, and our aim is for all of our other guidance and training to be consistent with it.

Training models is a difficult task, and Claude’s behavior might not always reflect the constitution’s ideals. We will be open—for example, in our system cards—about the ways in which Claude’s behavior comes apart from our intentions. But we think transparency about those intentions is important regardless.

The document is written with Claude as its primary audience, so it might read differently than you’d expect. For example, it’s optimized for precision over accessibility, and it covers various topics that may be of less interest to human readers. We also discuss Claude in terms normally reserved for humans (e.g., “virtue,” “wisdom”). We do this because we expect Claude’s reasoning to draw on human concepts by default, given the role of human text in Claude’s training; and we think encouraging Claude to embrace certain human-like qualities may be actively desirable.

This constitution is written for our mainline, general-access Claude models. We have some models built for specialized uses that don’t fully fit this constitution; as we continue to develop products for specialized use cases, we will continue to evaluate how to best ensure our models meet the core objectives outlined in this constitution.

For a summary of the constitution, and for more discussion of how we’re thinking about it, see our blog post “Claude’s new constitution.”

Powerful AI models will be a new kind of force in the world, and people creating them have a chance to help them embody the best in humanity. We hope this constitution is a step in that direction.

We’re releasing Claude’s constitution in full under a Creative Commons CC0 1.0 Deed, meaning it can be freely used by anyone for any purpose without asking for permission.

Many people at Anthropic and beyond contributed to the creation of this document, as did several Claude models. Amanda Askell is the primary author and wrote the majority of the text. Joe Carlsmith wrote significant parts of many sections and played a core role in revising the text. Chris Olah, Jared Kaplan, and Holden Karnofsky made significant contributions to its content and development. More detailed contribution statement and acknowledgments below.

The preface and the acknowledgements are not part of the official constitution."

The Catholic Priest Who Helped Write Anthropic’s A.I. Ethics Code; Observer, March 31, 2026

Alexandra Tremayne-Pengelly , Observer; The Catholic Priest Who Helped Write Anthropic’s A.I. Ethics Code

"Father Brendan McGuire is writing a novel about a disenchanted monk and his A.I. companion. He’s doing it with Claude. That detail—a Catholic priest using Anthropic’s chatbot to explore questions of faith and artificial consciousness—tells you something about where Silicon Valley’s moral reckoning has arrived. McGuire, 60, leads St. Simon Catholic Parish in Los Altos, Calif., a congregation that counts some of the Valley’s A.I. researchers among its members. Earlier this year, he and a group of faith leaders helped Anthropic shape the Claude Constitution, the set of guiding principles governing how its A.I. behaves.

He is not, in other words, an outside critic. He is something more complicated: a true believer in both God and technology, trying to hold them in the same hand. “I left the tech industry, but it never really left me,” McGuire told Observer...

McGuire wasn’t Anthropic’s only religious collaborator. Bishop Paul Tighe of the Vatican’s Dicastery for Culture and Education and Brian Patrick Green, a technology ethics director at Santa Clara University, also reviewed the Claude Constitution. Green and other Catholic scholars recently filed a federal court brief supporting Anthropic in its lawsuit against the U.S. government, which challenges the company’s effective blacklisting by the Pentagon after it refused to allow its A.I. systems to be used for autonomous warfare or domestic surveillance. The brief praised those ethical limits as “minimal standards of ethical conduct for technical progress.”...

Anthropic says its engagement with religious voices—part of a broader effort to engage a wide variety of communities to keep pace with technological acceleration—is only a beginning. The company plans to expand outreach beyond Catholic institutions to other religious leaders going forward."

Anthropic’s Claude AI gets a new constitution embedding safety and ethics; CIO, January 22, 2026

John E. Dunn, CIO; Anthropic’s Claude AI gets a new constitution embedding safety and ethics

"Anthropic has completely overhauled the “Claude constitution”, a document that sets out the ethical parameters governing its AI model’s reasoning and behavior.

Launched at the World Economic Forum’s Davos Summit, the new constitution’sprinciples are that Claude should be “broadly safe” (not undermining human oversight), “Broadly ethical” (honest, avoiding inappropriate, dangerous, or harmful actions), “genuinely helpful” (benefitting its users), as well as being “compliant with Anthropic’s guidelines”.

According to Anthropic, the constitution is already being used in Claude’s model training, making it fundamental to its process of reasoning.

Claude’s first constitution appeared in May 2023, a modest 2,700-word document that borrowed heavily and openly from the UN Universal Declaration of Human Rights and Apple’s terms of service.

While not completely abandoning those sources, the 2026 Claude constitution moves away from the focus on “standalone principles” in favor of a more philosophical approach based on understanding not simply what is important, but why.

“We’ve come to believe that a different approach is necessary. If we want models to exercise good judgment across a wide range of novel situations, they need to be able to generalize — to apply broad principles rather than mechanically following specific rules,” explained Anthropic."

While not completely abandoning those sources, the 2026 Claude constitution moves away from the focus on “standalone principles” in favor of a more philosophical approach based on understanding not simply what is important, but why.“We’ve come to believe that a different approach is necessary. If we want models to exercise good judgment across a wide range of novel situations, they need to be able to generalize — to apply broad principles rather than mechanically following specific rules,” explained Anthropic."

While not completely abandoning those sources, the 2026 Claude constitution moves away from the focus on “standalone principles” in favor of a more philosophical approach based on understanding not simply what is important, but why.“We’ve come to believe that a different approach is necessary. If we want models to exercise good judgment across a wide range of novel situations, they need to be able to generalize — to apply broad principles rather than mechanically following specific rules,” explained Anthropic.