Claude Desktop and OpenAI Codex come from different companies and do different things. Claude Desktop is a chat app. Codex is a coding agent. If you came here wondering which "Claude or OpenAI tool" to install, the better question is what you want to do.
The short version
| Claude Desktop | OpenAI Codex | |
|---|---|---|
| What it is | Anthropic's Claude chat app for Mac and Windows | OpenAI's coding agent |
| Where you use it | A desktop app | Command-line tool, IDE extension and cloud service |
| Sign-in | A Claude account, free tier available | A ChatGPT account, or an API key |
| Free plan | Yes | Included with ChatGPT plans, and OpenAI lists a Free plan for quick tasks (check limits). Or use API credits |
| Open source | No | Yes |
| MCP support | Yes | Yes |
| Project instructions | Not a headline feature | Reads AGENTS.md |
Check Claude's pricing and OpenAI's Codex docs for current plans.
What they have in common
- Both support MCP (Model Context Protocol, a standard way to connect extra tools to an AI).
- Both are made by AI labs and tied to that lab's account.
- Both take plain-English instructions.
Key differences
The job. Claude Desktop is for conversation and connected tools: linking Claude to things like calendars, documents and project trackers. Codex is for software: it reads, changes and runs code in a directory you choose.
Where it runs. Claude Desktop is a regular app, no terminal needed. The Codex CLI installs with npm install -g @openai/codex; OpenAI also offers an IDE extension and cloud tasks. With an API key, some features, such as cloud threads, might not be available, per OpenAI's quickstart.
Cost to start. Claude Desktop can be used with a free Claude account. Codex is included with ChatGPT plans (OpenAI lists a Free plan for quick tasks, so check its limits), or you can pay for API credits.
Limits of each. Claude Desktop's own page says it isn't a coding agent and doesn't work across a codebase. Codex is terminal-first, so there's a learning curve if you've never used a terminal.
Safety. Claude Desktop connectors can read or change data in your accounts, so review what you grant. Codex runs on your code, so review the changes it proposes.
Using both together
There's no conflict in having both. One could help you plan and draft, the other make changes in a project. See Claude Desktop and OpenAI Codex for more. If you want Anthropic's terminal agent for comparison, see Claude Code vs OpenAI Codex.
Who should pick what
- You don't write code and want an everyday assistant: Claude Desktop.
- You write code and want an agent in the terminal or IDE: OpenAI Codex.
- You already pay for ChatGPT: Codex may be included in your plan. Confirm with OpenAI.
- You want to try for free: Claude Desktop is the clearer free start. Check what OpenAI's Free plan includes for Codex.
Our verdict
These two don't compete head-on. Choose Claude Desktop for chat and connected apps, Codex for working on code. If your need is a coding agent from Anthropic rather than a chat app, look at Claude Code instead.