Harness Active Open source
Codex CLI
OpenAI's open-source coding agent for the terminal, with cloud and app-server counterparts.
Get Codex CLI 4 methods
curl -fsSL https://chatgpt.com/codex/install.sh | sh powershell -ExecutionPolicy ByPass -c "irm https://chatgpt.com/codex/install.ps1 | iex" npm install -g @openai/codex brew install --cask codex AboutOpenAI
Codex CLI inspects and edits a local repository and runs commands from the terminal. It supports plan mode, subagents, MCP servers, managed git worktrees, and handoff between local and cloud sessions.
Features Verified 8/8 ✓ yes ✗ no ? not verified
✓
Worktrees
Keeps parallel work in separate git worktrees?
yes
✓
Parallel agents
Runs several agent sessions at the same time?
yes
✓
Subagents
Can an agent delegate work to child agents?
yes
✓
MCP
Connects to MCP servers and their tools?
yes
✓
Remote access
Can you follow or control sessions from another device?
yes
✓
Cloud sandbox
Runs work in a hosted sandbox rather than on your machine?
yes
✓
Diff review
Includes a built-in diff or review screen?
yes
✓
Plan mode
Has an explicit plan / approve-before-edit step?
yes
Runs inside25
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