SUMMARY
CodeRabbit (Platform) uses yaml configuration while OpenAI Codex CLI (CLI) uses markdown. They differ on 7 of 11 compared features. Both tools provide AI-assisted development but take different approaches to project configuration.
FEATURE COMPARISON
| Feature | CodeRabbit | OpenAI Codex CLI |
|---|---|---|
| Config format | yaml | markdown |
| Hierarchy support | ✗ | ✓ |
| Global config | ✗ | ✓ |
| Project config | ✓ | ✓ |
| Subdirectory scoping | ✗ | ✓ |
| File inclusion / imports | ✗ | ✗ |
| Ignore file | ✗ | .codexignore |
| IDE integration | Platform | CLI |
| Schema / structure | unknown | Free-form (Markdown) |
| Git committed | ✓ | ✓ |
| Encoding | UTF-8 | UTF-8 |
FILE MAPPING
| Purpose | CodeRabbit | OpenAI Codex CLI |
|---|---|---|
| Settings / configuration | .coderabbit.yaml | ~/.codex/config.toml |
KEY DIFFERENCES
CodeRabbit: yaml. OpenAI Codex CLI: markdown.
CodeRabbit: Not supported. OpenAI Codex CLI: Supported.
CodeRabbit: Not supported. OpenAI Codex CLI: Supported.
CodeRabbit: Not supported. OpenAI Codex CLI: Supported.
CodeRabbit: Not supported. OpenAI Codex CLI: .codexignore.
CodeRabbit: Platform. OpenAI Codex CLI: CLI.
CodeRabbit: unknown. OpenAI Codex CLI: Free-form (Markdown).
WHICH SHOULD I USE?
Choose based on your IDE/CLI preference. If you use CodeRabbit, configure .coderabbit.yaml. If you use OpenAI Codex CLI, configure AGENTS.md. Many projects include config files for multiple tools so each team member can use their preferred editor.
PORTABILITY TIP
# Maintain a single source of truth:
cp AI-INSTRUCTIONS.md CLAUDE.md
cp AI-INSTRUCTIONS.md .cursorrules
cp AI-INSTRUCTIONS.md AGENTS.md