Claude Code vs Codex
Claude Code is Anthropic's coding agent. Codex is OpenAI's coding agent. Both read SKILL.md skills, so one skill can work in both.
Side by side
| Claude Code | Codex | |
|---|---|---|
| Made by | Anthropic | OpenAI |
| Models | Claude models | OpenAI models |
| Skills folder | ~/.claude/skills/ or .claude/skills/ | .agents/skills/ |
| Project guidance | CLAUDE.md | AGENTS.md |
Which one to choose
Try both on a real task from your own codebase. Results depend on the task and the model. Pick the one that fits how you work.
Skills work in both
Keep one skill folder and copy it into each tool. Browse Claude Code skills and Codex skills.
Questions
Do Claude Code skills work in Codex?
Most do. Both use SKILL.md. Some skills mention tool-specific commands, so read them first.
What is AGENTS.md?
A project file with guidance for coding agents. Codex reads it. It plays a role like CLAUDE.md in Claude Code.