Claude’s Character

Listen to our conversation about Claude's character in the video above.

Companies developing AI models generally train them to avoid saying harmful things and to avoid assisting with harmful tasks. The goal of this is to train models to behave in ways that are "harmless". But when we think of the character of those we find genuinely admirable, we don’t just think of harm avoidance. We think about those who are curious about the world, who strive to tell the truth without being unkind, and who are able to see many sides of an issue without becoming overconfident or overly cautious in their views. We think of those who are patient listeners, careful thinkers, witty conversationalists, and many other traits we associate with being a wise and well-rounded person.

AI models are not, of course, people. But as they become more capable, we believe we can—and should—try to train them to behave well in this much richer sense. Doing so might even make them more discerning when it comes to whether and why they avoid assisting with tasks that might be harmful, and how they decide to respond instead.

Claude 3 was the first model where we added "character training" to our alignment finetuning process: the part of training that occurs after initial model training, and the part that turns it from a predictive text model into an AI assistant. The goal of character training is to make Claude begin to have more nuanced, richer traits like curiosity, open-mindedness, and thoughtfulness.

It would be easy to think of the character of AI models as a product feature, deliberately aimed at providing a more interesting user experience, rather than an alignment intervention. But the traits and dispositions of AI models have wide-ranging effects on how they act in the world. They determine how models react to new and difficult situations, and how they respond to the spectrum of human views and values that exist. Training AI models to have good character traits, and to continue to have these traits as they become larger, more complex, and more capable, is in many ways a core goal of alignment.

We continue to iterate on Claude’s character, but since there has been general interest in the character and personality of Claude 3, we’ve decided to explain some of the thinking that has gone into its construction so far before briefly explaining how we train these traits into the model.