Claude Code vs OpenAI Codex
Pricing
Claude Code: Included in all paid Claude plans (Pro $20/mo, Max $100-200/mo) or pay-as-you-go via the Anthropic API
OpenAI Codex: Included in ChatGPT plans (Plus $20/mo, Pro from $100/mo), limited use on Free and Go
Description
Claude Code: Anthropic's AI coding tool that reads your entire codebase and makes changes across files, from your terminal, IDE, desktop app or browser
OpenAI Codex: OpenAI's coding agent, which works in the ChatGPT desktop app, your terminal, your editor and the cloud on your ChatGPT plan
Pros
- Understands large codebases better than most, with a 1M token context window on current models
- Terminal-native means it fits into git workflows without friction
- Genuinely good at multi-file refactoring and complex tasks
- Runs in the ChatGPT desktop app, the CLI, an IDE extension and on the web, all tied to one ChatGPT account
- Cloud tasks keep going after you close your laptop, in a reusable environment for each repo
- Reviews GitHub pull requests when you tag @Codex or turn on automatic reviews
Cons
- API costs add up fast on big projects: a heavy session can cost $5-20
- The $20 Pro plan is pitched at short coding sprints in small codebases; heavier use means Max at $100-200/mo
- No free tier; requires a paid Claude plan or an Anthropic Console account
- Free and Go plans only get limited use in the desktop app, on the smaller GPT-6 Luna model
- Plus usage is counted per five-hour window and weekly limits can also apply, and how far it goes depends on the model and the size of the task
- Running it on an API key instead of a plan drops the cloud features, such as GitHub code review and Slack
Details
Claude Code works directly with your git repo. It runs in your terminal, and also as a VS Code or JetBrains extension, a desktop app, and in the browser at claude.ai/code. You describe what you want changed, it reads the relevant files, makes edits, and can even run your tests to check its work.
Where it really shines is tasks that touch many files at once. “Rename this concept across the whole project” or “add TypeScript types to all these API routes” is the kind of tedious refactoring that would take you hours. The catch is cost. Every paid Claude plan includes it, starting with Pro at $20/month, and the Max plans at $100-200/month give you much more usage for a fixed price. You can also run it on the Anthropic API through a Console account and pay per token, but heavy usage on a large codebase can get expensive.
Codex is OpenAI’s coding agent. You hand it a task, such as a hard-to-find bug, a refactor or a new feature, and it reads the code, makes the changes and checks its own work, using browser and computer tools where it needs them. It can run several agents in parallel, and cloud tasks carry on while your laptop is closed.
It comes with ChatGPT, so if you already pay for Plus you already have it. The same account works in the desktop app, the terminal, your editor and on iOS.
OpenAI describes Plus at $20/month as enough for a few focused coding sessions a week. Heavier use means Pro, from $100/month, which currently has no five-hour limit, or buying extra credits when you hit the limit. You can also run the CLI on an API key and pay standard API rates, which suits automation such as CI.
Claude Code verified
OpenAI Codex verified
