OpenAI Codex CLI
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Lightweight coding agent in the terminal — reads, changes, and runs code locally
Key Features
Multi-Agent
Single Agent
Human-in-the-Loop
Streaming
Async Support
Type Safe
Short-Term Memory
Long-Term Memory
Shared Memory
Plugin System
Custom Tools
MCP Protocol
A2A Protocol
Code Execution
Web Browsing
File System Access
Sandboxing
Guardrails
Structured Output
DAG Workflows
Visual Builder
CLI
API Server
Self-Hosted
Cloud Hosted
Community Feedback
Strengths
- Free with API key
- Clean UI
- Rust performance
- Strong sandbox security
- Affordable with gpt-4o
Weaknesses
- macOS-only desktop app
- Doesn't show reasoning by default
- Declining output quality reports
- Subagents consume more tokens
OpenAI Codex CLI Details
| Organization | OpenAI |
| Organization Type | Company |
| Funding | Series b+ |
| Category | Ready-to-Use |
| Subcategory | Code generation |
| Deployment | Self-Hosted |
| Primary Language | Rust |
| Runtime | macOS, Linux, Windows (experimental) |
| License | Apache-2.0 |
| Commercial Use | Permissive |
| Install Command | brew install openai-codex |
| GitHub Stars | 67,340 |
| GitHub Forks | 9,013 |
| Release Cadence | Weekly |
| Maturity | Stable |
| Pricing Model | Free |
| Free Tier | Free with OpenAI API key |
| Self-Hosted Free | Yes |
| Cost Model | free + API costs |
| Community Size | Very large |
| Community Activity | Very active |
| Sentiment | Positive |
| GPU Required | No |
| Confidence | High |
| Research Date | 2026-03-24 |
| LLM Providers | OpenAI (GPT-4o, o3, o4-mini) |
| API Keys Required | OpenAI API key |
Use Cases
- Code generation and editing
- Sandboxed code execution
- Quick code tasks from the terminal
- Bug fixing and refactoring
Similar Tools
Claude CodeCodex cheaper/simpler, Claude Code more features
AiderCodex sandboxed, Aider git-first
When to Use
Best for: Developers wanting free, sandboxed AI coding assistance
Avoid when: Need rich plugin/hook ecosystem or Windows support
Original data from HuggingFace, OpenCompass and various public git repos.
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Release v20260324