According to Greg Brockman on Twitter, Codex has introduced a new personalities feature in the Codex app, allowing users to select between different interaction styles, such as a pragmatic engineer or a friendly coding buddy. This update, as shared by pranaveight, aims to improve user experience and productivity by tailoring Codex's AI assistant to developer preferences. The move signals increased focus on personalization in developer AI tools, which could lead to wider adoption and improved workflow efficiency.