Comparison
Claude Code vs OpenAI Codex
Claude Code: Anthropic's coding agent, in your terminal and your editor. OpenAI Codex: OpenAI's coding agent, included with ChatGPT.
| Claude Code | OpenAI Codex | |
|---|---|---|
| Rating | 4.8 | 4.5 |
| Price | Paid Included in Claude's paid plans: Pro $17/month annual ($20 monthly), Max $100 and $200/month. Teams from $20/seat. Also available via API. | Freemium Limited use on the free ChatGPT plan. Go $8/month, Plus $20/month, Pro $100-200/month, Business $25/user/month. Since April 2026 it bills against token credits. |
| Free plan | ||
| API available | ||
| Open source | ||
| In Spanish | ||
| No watermark | — | — |
| Platforms | Windows · Mac · Linux · Web | Web · Windows · Mac · Linux · iOS |
Claude Code or OpenAI Codex?
Both are powerful terminal agents and the choice usually comes down to which subscription you already pay for. Codex is included with ChatGPT, so if you are already a customer it is almost free, although since April 2026 it bills against token credits and spending is hard to predict. Claude Code is the benchmark for many developers on long tasks across large repositories.
Choose Claude Code if…
You prioritise capability on long tasks and prefer more predictable usage limits.
Choose OpenAI Codex if…
You already pay for ChatGPT and want to make use of it, or you like that its CLI is open source.
Claude Code
- Understands whole repositories and works across many files at once
- One subscription covers Claude web, desktop, mobile and Claude Code
- Anthropic doubled the usage limits in May 2026
- No free plan: it requires a paid subscription from day one
- Once weekly limits run out it can switch to per-token billing
OpenAI Codex
- Included in the ChatGPT subscription you already pay for
- Its CLI is open source and accepts your own API key
- Works in the cloud on several tasks at once
- Since April 2026 it bills against token credits: hard to predict
- Real heavy usage runs to $100-200 a month per developer
The differences that actually matter
Where the work runs
Claude Code runs on your machine, on your files, with access to your environment as it is. Codex leans more on running tasks in an isolated cloud environment. One fits better when the project depends on your local setup; the other when you want to fire off tasks and forget them.
The model underneath
Each uses its own house models, and both are front-rank for coding. In practice the quality differences are smaller than the workflow differences, so choosing by model usually means choosing by what matters least.
Which subscription you already have
Both come bundled with their respective assistants' paid plans, so if you already pay for one, the matching agent comes at no extra cost. For most people that is the practical deciding factor, above any capability comparison.
Frequently asked questions
Which is better for long, autonomous tasks?
Both are designed for it and the answer depends more on your project than on the tool. If your code needs local services, databases or specific configuration to run, an agent working on your machine saves you recreating all that in the cloud.
Do you have to review everything they write?
Yes, and it is the most underestimated part. An agent can touch fifteen files in one task, and the resulting code compiles and looks right more often than it is right. Always working on a separate branch and reading the full diff before merging is the reasonable minimum.