Codex CLI · OpenAI
OpenAI's open-source (Apache-2.0) Rust-rewritten terminal coding agent, distinguished by kernel-level OS sandboxing (Apple Seatbelt on macOS, Landlock/seccomp on Linux), a 272K-1M token context with GPT-5.x Codex models, MCP support, and cloud handoff to Codex web tasks.
Identity
| Homepage | https://developers.openai.com/codex/cli |
|---|---|
| Repository | https://github.com/openai/codex |
| License | open-source |
| Domain | coding |
| Form factor | cli · tui · ide-extension · cloud-service · sdk · ci-step |
Model support
| Model-agnostic | partial |
|---|---|
| Native models | GPT-5.4 · GPT-5.3-Codex |
| Local models | ✓ yes |
| Pricing | subscription |
Extensibility
| MCP client | ✓ yes |
|---|---|
| Agent Skills support | ? unknown |
| Plugins / hooks | ? unknown |
Execution & safety
| Sandboxing | os-sandbox |
|---|---|
| Autonomy spectrum | supervised → semi-autonomous → autonomous-local → background-cloud |
| Subagents | ? unknown |
| Parallel sessions | ✓ yes |
| Context management | compaction |
Integration & evidence
| Headless / API | ✓ yes |
|---|---|
| GitHub integration | ✓ yes |
| Sources |
✓ profile last verified 2026-07-08 · benchmark figures are vendor-reported unless a source states otherwise