Codex alternatives

Short answer: the main Codex alternatives are Claude Code for Claude models, Cursor for editor-first work, OpenCode for open source with any model, and Gemini CLI for Google Cloud teams. For background tasks like Codex Cloud, look at GitHub Copilot's cloud agent, Jules or Devin. On a team, people can keep Codex and use others too: Coagy shows everyone's Codex, Claude Code, Gemini CLI and Cursor sessions in one place.

What Codex is

Codex is OpenAI's coding agent. The CLI is open source under Apache-2.0. It also runs as an IDE extension in VS Code, Cursor and Windsurf, as a mode inside the ChatGPT desktop app, and as Codex Cloud on the web, with GitHub, Slack and Linear hooks.

It comes with ChatGPT (pricing): Free for quick tasks, Go $8, Plus $20, Pro $100 to $500, Business $25 per user per month. Reviewers rate it good for background and cloud batch work, and it used far fewer tokens than Claude Code in one benchmark (1.5M vs 6.2M).

Why people look for a Codex alternative

• OpenAI models only, unless you bring an API key.
• API keys don't get the cloud. With a key, Codex works in the CLI and IDE only.
• You want Claude. Claude Code is still the most used agent: 66% in the Stack Overflow 2026 survey.
• You want an editor, not a terminal or a chat window.

The alternatives

Tool	Open source	Models	Background or cloud tasks	Paid plans start at
Codex	CLI yes	OpenAI, or API key	Codex Cloud	Go, $8/mo
Claude Code	No	Claude	Background agents, web sessions	Pro, $20/mo
Cursor	No	Grok, Composer; others at API price	Cloud agents (Premium)	Plus, $8/mo
OpenCode	Yes (MIT)	Any provider	No	Free with your own keys
Gemini CLI	Yes (Apache-2.0)	Gemini	No	Code Assist or paid API key

Claude Code. Anthropic's agent, Claude models only, in the terminal, VS Code, JetBrains, a desktop app and on the web (docs). Pro $20, Max $100, Ultra $200 (pricing). Strong at large multi-file changes, heavier on tokens. See Codex vs Claude Code.

Cursor. An editor with parallel agents in worktrees and cloud agents on Premium ($30). Since October 2026, plans center on Grok, and Claude, GPT and Gemini cost API list price on top (pricing). See Codex vs Cursor.

OpenCode. MIT licensed, any model, free with your own keys. It also supports ChatGPT Plus and Pro sign-in, so you can keep paying OpenAI and use a different tool.

Gemini CLI. Open source, but since June 18, 2026 it needs a Code Assist license or a paid API key. Free and Google AI Pro users moved to Antigravity CLI.

Cloud agents like Codex Cloud. GitHub Copilot's cloud agent works from issues. Google's Jules runs tasks in a cloud VM. Devin from Cognition is another background option.

Codex isn't an all-or-nothing choice

The honest answer for most teams is "Codex and something else". Reviewers mostly recommend mixing tools: Codex for batch work in the background, Claude Code or Cursor for hands-on work.

The trouble starts when three people run three different agents and nobody can see the others. Coagy fixes that part. Each developer keeps their own Codex, Claude Code, Gemini CLI or Cursor, on their own subscription, and a connector mirrors their sessions into one team workspace. Teammates can watch, ask an agent what it changed, and pick up a session with its context. Every task runs in its own git worktree, and agents can keep running in Coagy cloud when your laptop is closed. Free for up to 4 developers.

Solo? Coagy Local runs Codex, Claude Code, Cursor and OpenCode side by side, free. More on running several agents at once.

Questions

What is the best alternative to OpenAI Codex?

Claude Code if you want Claude models, Cursor if you want to work in an editor, and OpenCode if you want open source with any model. For cloud tasks like Codex Cloud, GitHub Copilot's cloud agent, Jules and Devin are options.

Is Codex open source?

The Codex CLI is open source under Apache-2.0. Codex Cloud and the Codex mode in the ChatGPT desktop app are not.

Can I use my ChatGPT subscription outside Codex?

Yes. OpenCode supports signing in with ChatGPT Plus or Pro, so you can use your OpenAI plan in an open source tool.

Can my team use Codex and Claude Code together?

Yes. With Coagy each developer runs their own Codex, Claude Code, Gemini CLI or Cursor with their own subscription, and the team sees everyone's sessions in one shared workspace. It is free for up to 4 developers.