Get a second opinion from OpenAI's Codex CLI without leaving Claude Code.
claude skill install hksw-io/codex-skill
/codex What does this function do?
/codex model:o3 reasoning:xhigh Explain the auth flow
/codex fast:on Summarize test coverage gaps| Arg | Example | Description |
|---|---|---|
model:VALUE |
model:o3 |
Model override |
reasoning:VALUE |
reasoning:high |
Reasoning effort: low, medium, high, xhigh |
fast:on|off |
fast:on |
Service tier |
| (rest) | Explain this code |
Prompt (required) |
All flags are optional — defaults come from ~/.codex/config.toml.
Runs codex exec via the Bash tool in read-only sandbox. Codex can read your codebase but cannot modify files.
- Codex CLI installed
- OpenAI API key configured
MIT