Command reference · Codex CLI

/personality

Chooses how Codex responds, when the model supports personalities.

/personality chooses a communication style for Codex's responses, provided the currently used model supports personalities. This lets you make Codex sound more concise, more explanatory, or more collaborative, for example. According to the docs, the command only changes the tone and style of the responses — not your actual instructions and not the technical content of the work. Like /fast, /personality is documented both in the pure terminal CLI command list and in the general Codex command reference, so it's a regular terminal CLI feature and not a desktop-app-exclusive one. Despite the unusual name, it's not an easter egg but an officially documented feature — whether it's available for your current model depends on the model itself, similar to /fast.