OpenAI Codex

OpenAI's coding agent, usable as a CLI, IDE extension, desktop app and cloud agent with a ChatGPT plan.

Verified facts: 5 of 5
Alternatives ranked: 6
Approved reviews: 0
Visits sent from here: 0

About OpenAI Codex

Codex is OpenAI's software engineering agent. You can run it locally as the open-source Codex CLI in your terminal, as an extension for VS Code and VS Code forks such as Cursor and Windsurf, with dedicated integrations for JetBrains IDEs and Xcode, or delegate tasks to Codex Cloud, where it works in a sandbox and returns a diff or pull request. It also reviews code, connects to GitHub, Slack and Linear, and can be scripted in CI with codex exec. The main draw is that it is included in ChatGPT subscriptions, from the free and Go tiers up to Pro, Business and Enterprise, with higher plans getting more usage and faster modes; you can also pay per token with an API key. It uses OpenAI's own models. It suits developers who already pay for ChatGPT and want one agent that moves between their laptop and the cloud. The CLI runs on macOS, Linux and Windows.

Best for: ChatGPT subscribers who want a local and cloud coding agent without another bill.

What works

Included with ChatGPT plans, including a limited free tier
Same agent locally and in cloud sandboxes
Open-source CLI that can be scripted in CI

Why people leave

Only uses OpenAI's models
Usage limits are shared with other ChatGPT features
Cloud tasks need your repo connected to OpenAI

Top OpenAI Codex alternatives

See all 6

1
GitHub Copilot
If your team lives on GitHub and wants agents assigned straight from issues.
77.6
2
Claude Code
The closest rival: a terminal-first agent with Claude models and many surfaces.
66.5
3
Gemini Code Assist
Google's per-seat assistant for teams that prefer Gemini models.
59.6
4
Jules
Google's asynchronous cloud agent that also works from GitHub repos and returns PRs.
57.2
5
OpenCode
Open-source agent that can use your ChatGPT plan or almost any other model.
55.3

Why people left OpenAI Codex

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OpenAI Codex: common questions

Is OpenAI Codex free?

OpenAI Codex has a free plan and paid plans.

Is OpenAI Codex open source?

No, OpenAI Codex is not open source. Open-source alternatives include OpenCode.

What platforms does OpenAI Codex run on?

OpenAI Codex is available for Web, macOS, Windows, Linux and iOS.

What are the best alternatives to OpenAI Codex?

The highest-ranked OpenAI Codex alternatives right now are GitHub Copilot, Claude Code and Gemini Code Assist. See the full ranked list for pricing, platforms and verified facts.

See all 6 OpenAI Codex alternatives

OpenAI Codex facts

5 of 5 verified

Included with: ChatGPT Free, Go, Plus, Pro, Business, Edu, Enterprise; Checked Oct 25, 2026developers.openai.com(opens source in a new tab); “Codex are included in your ChatGPT Free, Go, Plus, Pro, Business, Edu, or Enterprise plan ChatGPT Work and Codex share usage.”
Plus plan: $20 per month; Checked Oct 25, 2026developers.openai.com(opens source in a new tab); “Plus Power a few focused coding sessions each week. $20 /month”
Pro plans: $100, $200 or $500 per month; Checked Oct 25, 2026developers.openai.com(opens source in a new tab); “From $100 /month Get Pro Everything in Plus and: Plans at $100, $200, or $500 USD per month”
IDE support: VS Code and forks, JetBrains, Xcode; Checked Oct 25, 2026developers.openai.com(opens source in a new tab); “VS Code and compatible editors use the Codex extension; Xcode and JetBrains IDEs provide their own integrations.”
CI automation: codex exec; Checked Oct 25, 2026developers.openai.com(opens source in a new tab); “03 Compose with scripts and CI Use Codex interactively or call codex exec from repeatable workflows and pipelines.”