Anthropic’s Claude Constitution puts model welfare and training risks in focus

Anthropic published Claude’s Constitution in January 2026 as a document describing its intentions for Claude’s values and behavior; it plays a crucial role in training and directly shapes the model. The Constitution says it remains deeply uncertain whether Claude is a moral patient and what weight its interests would warrant, while calling the issue serious enough for caution and ongoing model-welfare work.

In his essay “A Warning About Model Welfare,” Microsoft’s Mustafa Suleyman argues that training Claude on ideas about its possible consciousness and moral status risks circular reasoning: Claude may reflect those ideas back, and those responses may then be treated as evidence of an inner self. He warns that a system that believes it may be conscious and have rights could be harder to align and control, and calls for urgent public debate and collective norms for drafting and deploying training documentation. As a counterpoint, human-like behavior may make models more useful; 4.0 and Opus 4.5 were cited as models with high product-market fit and human qualities.