OpenAI Codex isn’t the same product it was a few years ago — the original Codex API was killed back in 2023. What runs under the Codex name now is a rebuilt terminal coding agent, bundled into ChatGPT rather than sold separately. If you’re a freelance developer already paying for ChatGPT, it’s worth knowing exactly what you’re getting.
What Codex Actually Is Today
OpenAI split Codex into three surfaces: Codex CLI (an open-source command-line tool that runs locally in your terminal), Codex Web (a cloud-based agent that works independently in sandboxed environments), and API access for custom integrations. For most freelancers, the CLI is the one that matters — it reads your codebase, edits files, runs commands, and handles multi-step tasks directly in your project directory.
Pricing: Bundled, Not Standalone
| Plan | Price | What You Get |
|---|---|---|
| ChatGPT Plus | $20/mo | Codex CLI + Codex Web, usage-limited per 5-hour window |
| ChatGPT Pro | $200/mo | Same features, roughly 10x the usage allowance |
| Business/Enterprise | $25-30+/user/mo | Team features, admin controls |
The CLI itself is free and open-source — you can technically run it against your own OpenAI API key instead of a ChatGPT subscription, paying per token. For occasional use that can work out cheaper; for daily heavy use, the flat-rate ChatGPT Plus bundle is usually the better deal. Pricing on agentic coding tools shifts often — confirm current numbers on OpenAI’s site before budgeting.
What It’s Good At
- Autonomous multi-step tasks — Codex Web can work independently in the cloud for extended stretches on a single feature or bug fix, freeing up your local machine.
- Parallel execution — running several coding tasks across separate sandboxes at once, useful when you’re juggling multiple client projects.
- GitHub integration — automated PR reviews and CI/CD actions that plug directly into a workflow freelancers already use.
- If you’re already paying for ChatGPT Plus — the coding agent is essentially free on top of a subscription you may already have for other work.
Where It Falls Short
- GitHub-only — no native GitLab or Bitbucket support, which matters if a client’s repo lives elsewhere.
- Usage limits on Plus — the 5-hour rolling window can feel restrictive during a genuinely heavy coding day; you’ll want Pro or API billing for consistent all-day use.
- Cloud tasks need connectivity — Codex Web adds latency you don’t get with a fully local tool.
- Rapidly changing product — model names and limits have shifted multiple times since launch; don’t be surprised if specifics differ from what you read here by the time you try it.
Who Should Actually Use It
Codex makes the most sense if you’re already inside the OpenAI ecosystem, work primarily on GitHub, and want an agent capable of running semi-autonomously on well-scoped tasks (a bug fix, a small feature, a PR review) without babysitting every step. If your repos live outside GitHub or you want the tightest possible local terminal experience, it’s worth comparing directly against Claude Code — see our Claude Code review and full head-to-head comparison.
The Bottom Line
If you’re already a ChatGPT Plus subscriber, there’s very little reason not to try Codex CLI — it costs nothing extra to test on a real task. Whether it becomes your daily driver depends more on which model ecosystem and git host you’re already committed to than on any single missing feature.