We recently gave Claude Opus 4 and 4.1 the ability to end conversations in our consumer chat interfaces. Claude Opus 4 showed:A strong preference against engaging with harmful tasks;A pattern of apparent distress when engaging with real-world users seeking harmful content; andA tendency to end harmful conversations when given the ability to do so in simulated user interactions. When Claude ends a conversation, the user can start a new chat, give feedback, or edit and retry previous messages. When Claude chooses to end a conversation, the user will no longer be able to send new messages in that conversation. To address the potential loss of important long-running conversations, users will still be able to edit and retry previous messages to create new branches of ended conversations.