OpenAI Codex CLI Review, Pricing & Alternatives (2026)

OpenAI Codex CLI is a terminal coding agent maintained by OpenAI. The current project launched in 2025, and its client is licensed under Apache 2.0. It runs on macOS, Linux, and Windows, with authentication through ChatGPT, an API key, or an access token. Codex is also available through OpenAI’s web, IDE, desktop, and mobile experiences, but the CLI is the direct option for developers who prefer a shell. OpenAI does not publish a separate Codex CLI user count, revenue figure, or valuation. The project is active, with installation and release paths documented through npm, Homebrew, OpenAI documentation, and GitHub. The software is open source, while hosted models and account services remain proprietary. It is designed for developers seeking repository work and automation from a command line.

A normal Codex CLI session begins in a project directory with a request such as fixing a failing test or adding a feature. Codex inspects relevant files, proposes or applies changes, runs commands, and reports results. Workspace-write sandboxing, approval prompts, additional directories, JSON output, and unattended execution options provide different levels of control. The reference also documents image attachments, web search, slash commands, usage views, and multi-agent tools. Developers can use interactive sessions for exploration or non-interactive execution in scripts and CI. The app server and plugin paths extend the client to other interfaces. Command approvals remain important because repository edits, package operations, and tests can have side effects. These controls support both hands-on development and automation-oriented workflows.

OpenAI’s Codex pricing page lists GPT-5.4, GPT-5.4-mini, and GPT-5.3-Codex across current Codex access paths. GPT-5.3-Codex-Spark is a research preview for ChatGPT Pro users and is not available in the API at launch. Model availability depends on the account or authentication method. The CLI can use configured providers and an open-source model mode, but ordinary hosted use depends on OpenAI services. Recent documentation covers agent view, multi-agent tools, voice, worktrees, usage statistics, and improved terminal rendering. Context size, reasoning effort, task complexity, speed configuration, and tool calls affect consumption. OpenAI warns that limits and model access can change as capabilities are introduced. The client supports macOS, Linux, and Windows.

The executable is free to install, but hosted access follows account or token pricing. ChatGPT Plus costs $20 per month and includes CLI, IDE extension, web, and iOS access. Pro costs $200 per month, Business costs $30 per user per month, and Enterprise or Edu pricing is custom. OpenAI also lists limited Free and Go access for a limited time, without giving Go a fixed price on the cited pricing page. Plus supports 33 to 168 GPT-5.4 local messages per five hours, while Pro supports 223 to 1,120, with model and task variation. API users pay token rates. GPT-5.3-Codex costs $1.75 input, $0.175 cached input, and $14 output per million tokens at standard rates.

Codex CLI suits developers who want terminal control, Apache 2.0 client code, and explicit boundaries around commands and files. It is less suitable for teams seeking a standalone CLI subscription, a fully local default model, or unrestricted unattended execution. Claude Code is the closest account-based alternative, while Gemini CLI provides a Google-centered terminal agent. Aider emphasizes a lightweight terminal workflow across model providers, and Cline offers an editor-centered approach. Codex’s API path also lacks cloud features such as GitHub code review and Slack integration. Choose Codex CLI when OpenAI models, ChatGPT billing, or an open client matter most, and retain approval prompts for unfamiliar repositories. Its audience is mainly terminal-focused developers, teams using sandbox controls, CI operators, and developers wanting an Apache 2.0 client.