Codex CLI vs Claude Fable 5.1
A side-by-side comparison of features, pricing, and characteristics.
Codex CLI
An open-source, terminal-based AI coding agent by OpenAI that automates repository tasks, reviews pull requests, and runs tests in sandboxed environments.
Read the full reviewClaude Fable 5.1
Anthropic general-availability frontier model for coding and knowledge work.
Read the full review| Attribute | Codex CLI | Claude Fable 5.1 |
|---|---|---|
| Pricing type | Free + paid (from $20/mo) | Paid |
| Korean support | No | No |
| Platforms | macOS, Linux, Windows (WSL2) | - |
| Open source | Yes | No |
| API available | - | Available |
| SDK | - | - |
| LLM-based | - | - |
| Multimodal | - | - |
| AI model | GPT, Codex | - |
| GitHub Stars | 122.0K | - |
| Vendor | OpenAI | - |
| Category | Developer Tools | Developer Tools |
| Details | View | View |
Codex CLI key features
- Terminal-based execution (CLI)
- Execution in an isolated cloud sandbox
- Natural language-based code generation and editing
- Automated testing and debugging loop
- Git and GitHub workflow integration (automatic PR generation)
- Custom skill expansion (SKILL.md)