Codex vs Claude Code: OpenAI and Anthropic Coding Agents Compared
Both coding agents now support local and cloud work. Compare current plans, account limits, Cowork and a practical workflow for using both.
TL;DR: Choose Codex for an OpenAI workflow or Claude Code for an Anthropic workflow, then test the environment, allowance and review effort on your own tasks.
Checked 28 October 2026. Both tools can inspect a repository, edit files and run commands. The useful comparison is which environment reaches your dependencies, how usage is billed and how reliably you can review the result.
What is the quick verdict on Codex vs Claude Code?
Start with Codex if your team already uses ChatGPT accounts and wants OpenAI's coding models across supported interfaces. Start with Claude Code if Anthropic's developer tools and integrations fit your existing workflow. Try each on the same small task before choosing a paid plan.
Both have a CLI, editor integrations, desktop and cloud workflows. Anthropic's Claude Code overview now describes browser and mobile access alongside local development. Include its remote sessions when comparing where work can run.
| Question | Codex | Claude Code |
|---|---|---|
| Best first trial | Existing ChatGPT/OpenAI development workflow | Existing Claude/Anthropic development workflow |
| Local coding | CLI, IDE and desktop workflows | CLI, IDE and desktop workflows |
| Remote execution | Cloud tasks in their own workspaces | Cloud sessions in isolated environments |
| Files and dependencies | Depend on the selected environment and access | Depend on the selected environment and access |
| What still needs review? | Changes, test results, access and side effects | Changes, test results, access and side effects |
How are Codex and Claude Code different in approach?
Codex's environment guide distinguishes Local, Worktree and Cloud. Local and Worktree execute on your computer; a worktree isolates file changes within a Git checkout. Cloud tasks have their own working files, and your local browser sign-ins, running services and VPN access do not automatically transfer.
Codex Cloud uses a prepared, published environment. Treat dependency installation, repository access and network configuration as part of the task setup. A job that needs a database running only on your laptop may fit a local session better.
Claude Code also supports cloud execution. Anthropic-hosted sessions clone the selected repository into an isolated VM; self-hosted environments have different operational responsibilities. Choose a local session when you need quick iterations on uncommitted work or services on your computer.
How do Codex and Claude Code pricing and limits compare?
Prices checked October 2026 against OpenAI's plan page and Anthropic's plan page. The table shows indicative euro equivalents of their USD monthly list prices, not local checkout quotes.
Conversion uses the ECB reference rate dated 27 October 2026: one euro equals 1.115 US dollars. Divide the USD price by that rate; taxes, payment charges and regional billing can change the amount you pay.
| Individual plan | Indicative EUR/month | Buying distinction |
|---|---|---|
| Codex Free | €0.00 | Limited desktop rollout |
| Codex Go | €7.17 | Lightweight desktop rollout |
| Codex Plus | €17.94 | Paid coding workflows |
| Codex Pro | €89.69, €179.37, €448.43 | Tier-specific usage and features |
| Claude Pro | €17.94 | Claude Code included |
| Claude Max 5x / 20x | €89.69 / €179.37 | More usage than Pro |
Free and Go currently provide GPT-6 Luna desktop access subject to rollout, rather than the full paid workflow. OpenAI lists Pro options equivalent to €89.69, €179.37 and €448.43 at this rate. Anthropic's Free plan does not include Claude Code; Pro does, and Max increases usage. Annual discounts and organisational plans need their own comparison.
Equal fees do not establish equal task capacity. OpenAI's ChatGPT Work and Codex share usage, while actual allowances depend on the model and workload. Anthropic's Max page also advertises monthly API credits; check the current eligibility terms. For Codex, API-key authentication uses API billing and has feature differences from ChatGPT sign-in.
Where does Claude Cowork fit in this comparison?
Claude Cowork applies agentic work to files and deliverables beyond software development, such as reports, spreadsheets and presentations. Try it when the deliverable is an office file.
Anthropic has also announced that Cowork and chat are becoming one Claude experience. Rollout and account labels can differ; the announcement includes an Enterprise availability update dated 23 October. Do not assume an older Cowork screenshot matches every current account, or treat Cowork as a separate coding subscription.
Which models and context windows do they run?
OpenAI's current model guide recommends GPT-6.1 Sol for complex coding when available, with Luna for focused work. Availability depends on the plan, client, workspace and rollout. The old GPT-5.5 recommendation is no longer a current ChatGPT-sign-in baseline.
Anthropic's model configuration guide currently lists Opus 5.5 as the default for direct paid accounts, with provider and organisation exceptions. Context windows, compaction and extended-context rights vary. A large advertised window does not mean the entire repository is always loaded or that the agent understands every dependency.
Which is safer for proprietary code?
Review the exact deployment and account terms. Local command execution does not establish that model processing stays offline. Anthropic's data-usage documentation describes network requests and separate local/cloud data flows; repository content used as model context needs the same review as a typed prompt.
For either product, check the model provider, file access, network permissions and retention requirements before granting access to proprietary material. Limit credentials and external writes to what the task needs. Neither a terminal interface nor a cloud label proves a deployment meets your organisation's requirements.
Can you use Codex and Claude Code together?
Yes. A useful workflow is to let one agent implement a bounded change and ask the other to review that exact diff. Use separate branches or worktrees when both may edit, and record the commit or patch being handed over. Two agents editing the same working files simultaneously can invalidate each other's assumptions.
Give the reviewer the acceptance criteria, affected files and actual test output. Ask for failure cases rather than approval by consensus, then verify any finding against the code. A second model can still miss bugs; measure its review effort and usage during your trial.
Repository instructions help make that handoff explicit; the CLAUDE.md and AGENTS.md guide explains the file conventions. Keep runtime and tool setup separate too: the Claude MCP configuration guide covers its own client and scope boundaries.
Which should you pick?
Pick the candidate that can reach your required environment, offers the model and allowance you need, and produces changes you can check. Start with the subscription you already have before adding another. Add Cowork-style task handling to the trial if the real deliverables include office files as well as code.
How do you decide in five minutes?
- Identify required files, services and network access before choosing local or cloud.
- Confirm the available model and plan features in the actual account.
- Run the same small task with clear acceptance criteria on each candidate.
- Compare completed outcomes, review effort and observed usage.
- Keep a human review and test gate before merging or publishing.
FAQ
Is Codex or Claude Code better for terminal work?
Both have a CLI that can work on a local repository. Compare shell integration, permissions and the task result in your environment rather than declaring a winner from interface labels.
Does Claude Code run my code in the cloud?
It can. Local sessions execute on your machine; cloud sessions run in a separate environment. Check the chosen session type before assuming local services or files are available.
How much do Codex and Claude Code cost?
The table gives dated euro equivalents of the vendors' monthly list prices. Compare the included features, shared usage, credit rules and checkout taxes; matching subscription fees do not guarantee matching capacity.
Can I use both Codex and Claude Code?
Yes. Give each a clear role and isolate edits, then hand over a specific patch or commit for review. Inspect findings and run checks before accepting changes.
Which has the bigger context window?
Compare the selected model and client rather than a product-wide maximum. Context limits and compaction vary, and a large window does not guarantee complete repository understanding.