C

Command-line Assistants

Codex CLI

OpenAI's coding agent for the terminal. It reads, edits, and tests your repository locally, delegates to subagents, connects to MCP servers, hands sessions off to Codex cloud, and runs non-interactively in CI with codex exec.

Highlights

  • Local first, cloud when needed

    Work in your checkout, then move a task to Codex cloud with codex cloud and apply the result back to your repository from the terminal.

  • Subagents

    Ask Codex to split an investigation across focused agents and bring their findings back into the main session.

  • Scriptable

    codex exec runs a task non-interactively for scripts, GitHub Actions, and CI, and the Codex SDK embeds the same agent in your own tools.

  • Sandbox and permissions

    Choose when Codex may edit files or run commands without asking, and inspect the writable roots before continuing.

  • Visual and web context

    Pass screenshots or diagrams with codex --image and switch on live web search with codex --search.

Available Models

GPT-6 Astra GPT-5.6 Sol GPT-5.6 Terra GPT-5.6 Luna GPT-5.5 GPT-5.4 GPT-5.3-Codex-Spark

Platforms

macOS Linux Windows

Install with npm install -g @openai/codex, brew install --cask codex, or curl -fsSL https://chatgpt.com/codex/install.sh | sh, then run codex and sign in with ChatGPT or an API key.

Pricing

Freemium
ChatGPT Free and Go Included, lower limits
ChatGPT Plus, Pro, Business, Edu, Enterprise Included
API key Per token at API rates
Plan usage is governed by rolling five-hour and weekly limits that vary by model and task; check them with /status. Signing in with an API key bills tokens directly and skips the cloud features such as code review and Slack.
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