Codex CLI
OpenAI’s official local command-line coding agent.
Models generate and reason. Agents use tools to work on tasks. A harness manages an agent’s environment. MCP connects tools and data. Skills are reusable task guidance.
Research notes
OpenAI’s official local command-line coding agent.
Validation
- OpenAI’s official local command-line coding agent.
Cost
Free software; check license and compute costs
Source code is public; model licensing, hardware, electricity and hosting are separate. Total cost is not verified.
Limits & boundaries
- Models, authentication, tools and runtime modes have separate boundaries; do not turn personal subscription credentials into a third-party API service.
- Official documentation reviewed; this site has not run this combination or tested the device.
Original sources
- Codex CLI official documentation ↗
github.com · 2026-10-15 · Official documentation