Claude Code and Codex are AI agents that read, edit and run files on your computer. Claude Code vs Codex comes down to fit: the plan you pay for, where you work and how each asks before acting. I run my agency on Claude Code and help owners learn Claude Code, so weigh my bias.
What is the difference between Claude Code and Codex?
Claude Code is Anthropic's agent and Codex is OpenAI's, and both work inside a folder you choose. Anthropic calls Claude Code an agentic coding tool that reads your codebase, edits files, runs commands.
OpenAI's Codex README calls Codex CLI a coding agent that runs locally on your computer. Treat them as two routes to the same jobs, then pick on plan, workflow and limits.
A Reddit user on r/codex who uses both wrote that "Codex is starting to feel like the broader work agent."
Claude Code vs Codex side by side
In that user's view, "Claude Code is very good when the job is mostly inside the repo."
Here's how the two compare on facts each company publishes, checked on November 12, 2026:
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Anthropic makes Claude Code, and OpenAI makes Codex.
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Claude Code runs in a terminal, VS Code, JetBrains, a desktop app, the web, Slack and GitHub Actions.
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Codex runs in a terminal, editor extensions, the ChatGPT desktop app, the web and iOS.
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Claude Code needs a paid Claude plan or a Console account, and the free plan doesn't include it.
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Codex signs in with a ChatGPT plan or an API key.
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Codex CLI is open source under Apache-2.0, while Claude Code's license reserves all rights to Anthropic.
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Codex reads AGENTS.md, and Claude Code reads CLAUDE.md but can also read an AGENTS.md file.
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Both use SKILL.md skills built on one open standard, and both connect to MCP servers.
Why I run my agency on Claude Code
I picked Claude Code early and built my agency's SEO workflow around it. Research, writing, schema and page checks all run inside it, as my guide to Claude Code for SEO shows.
That's habit and fit, not proof that Codex is worse. My video on the local SEO tools I use shows where Claude sits in my stack.
I'd point you to Codex if you already pay for ChatGPT and want one bill. A Reddit user on r/codex put it well: "What's better for me, might be terrible for you."
Where Codex and Claude Code run
In a Mac terminal
Both install with one terminal command. My guide to installing Claude Code on a Mac covers that side. OpenAI's README lists curl -fsSL https://chatgpt.com/codex/install.sh | sh for Codex.
In VS Code and other editors
Claude Code's extension works in VS Code and forks like Cursor. Codex's extension covers VS Code, Cursor and Windsurf.
In the Claude and ChatGPT desktop apps
Claude Code has a desktop app on paid plans and runs on the web. Codex lives in the ChatGPT desktop app, and its cloud tasks keep working while your computer sleeps.
Codex vs Claude plans and sign-in
Codex vs Claude often comes down to the subscription you already have. Claude Code needs a Pro, Max, Ultra, Team, Enterprise or Console account, per Anthropic's setup docs. The free claude.ai plan doesn't include it.
Codex signs in with ChatGPT or an API key. OpenAI's Codex pricing page lists the CLI and IDE extension on Plus. Free and Go get desktop-app access "subject to rollout".
Check both pricing pages before you subscribe, since plans and limits change often. Codex cloud tasks need a ChatGPT sign-in, not an API key.
How Claude Code and Codex ask before they act
Claude Code permission modes
Terminal sessions on v2.1.283 or later start in auto mode when it's available, and a classifier reviews actions. Press Shift+Tab for manual mode, which asks before most edits and commands, per Anthropic's permission modes page.
Codex sandbox and approvals
Codex pairs a sandbox with an approval policy. By default it has no network access and writes only inside your workspace, per OpenAI's security docs.
Git as your undo button
Neither replaces a backup. OpenAI's CLI docs suggest Git checkpoints before and after a task. Put your project under git and read each change before you accept it.
AGENTS.md and skills carry over between Codex and Claude Code
Switching later costs less than you'd think. Codex reads AGENTS.md files before any work, and Anthropic's memory docs say Claude can read an existing AGENTS.md.
Skills travel too. OpenAI's Codex skills page says they build on the open agent skills standard, and Anthropic's skills docs name the same standard.
Codex requires a name and description in each SKILL.md, so include both. My guide to Claude Code skills for SEO shows how to write your first one.
Codex vs Claude Code for SEO and marketing jobs
A marketer on r/ChatGPTPro wrote, "I built my first interactive web page with Codex in about two hours today."
Either tool can do these jobs when you bring the data and review the output:
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Title tags and meta descriptions from a page list or crawl export.
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Schema drafts from your page facts, checked before they go live.
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Search Console exports sorted into pages with impressions but few clicks.
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Page drafts written from your own facts and customer words.
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A static website built and previewed on your computer, as in my guide to building a website with Claude Code.
Usage limits in Codex and Claude Code
Usage limits come up often in both camps. One Claude Code user on r/codex wrote, "Hit the second 5h limit within 30 mins again!!"
Another said the "usage quota for what you spend" is better on Codex. OpenAI's pricing page says usage depends on the model, the task and whether it runs locally or in the cloud. Claude's pricing page lists which plans include Claude Code.
Test both on your own work for a week before you buy a bigger plan. A Reddit user noted that "comparisons from a few months ago already feel outdated."
How to choose between Claude Code and Codex
- Start with the plan you pay for. ChatGPT subscribers can try Codex first, and Claude subscribers can try Claude Code.
- Pick your window. Both run in a terminal, an editor and a desktop app.
- Decide how much it may do alone. Compare Claude Code's permission modes with Codex's sandbox and approvals.
- Run one real job in each, such as title tags for five pages, and compare the drafts.
- Keep your rules in AGENTS.md or CLAUDE.md and your repeat jobs in skills, so you can switch later.
- Choose the one you'll open every day. A tool you use beats a better one you avoid.
Learn Claude Code with my training and ready-made skills
If Claude Code is your pick, my training walks you through setup and real SEO jobs. You also get ready-made skills, so you can run the work yourself.
- Start here: how to install Claude Code on a Mac.
- Next step: Claude Code tutorial for business owners.
- Read how: Claude Code for SEO.