Claude Code vs OpenAI Codex: AI Coding Tool Comparison
Claude Code and OpenAI Codex are agents from two model vendors that both work in the terminal.
- Verified 4 Nov 2026Sources are dated on this page
- 4 sourcesLinked, typed and dated
- No winner declaredFit depends on your criteria
- Not tested by Stack18Editorial summary of documented facts
Claude Code vs OpenAI Codex: the short answer
Claude Code and OpenAI Codex are agents from two model vendors that both work in the terminal. Claude Code uses Anthropic's Claude models and is included in paid Claude plans or API billing; Codex uses OpenAI models and is included in ChatGPT plans or API billing.
Each is tied to one model family, so the practical choice often follows which vendor's subscription and models a team already uses. Both also run beyond the terminal: Claude Code in IDEs, a desktop app and the web, and Codex in an IDE extension, a desktop app, the web and iOS. We compare what documentation supports and mark everything else Unknown. We declare no overall winner, because the better choice depends on workflow, model preferences, oversight needs and budget.
Choose Claude Code if you- Terminal-first developers
- Teams that want documented permission and sandbox controls
- Workflows that use subagents, MCP integrations or CI automation
Choose OpenAI Codex if you- ChatGPT subscribers who write code
- Teams that want cloud task delegation and automated review
- Developers who want an open-source-style CLI with OpenAI models
Claude Code and OpenAI Codex at a glance.
One card per product, drawn from each full profile. Open a profile for features, pricing plans, limits and sources.
Claude Code
Anthropic · AI Coding Agents
Claude Code is Anthropic's agentic coding tool. It runs in a terminal, in VS Code and JetBrains extensions, in a desktop app and on the web, and uses Claude models with tools, permissions and subagents.
Agentic tool- Pricing
- Included with paid Claude plans, or usage-based via API billing.
- Best for
- Terminal-first developers
OpenAI Codex
OpenAI · AI Coding Agents
OpenAI Codex is OpenAI's software engineering agent. It runs in a terminal CLI, an IDE extension, a desktop app and a cloud environment, signs in with a ChatGPT account or an API key, and uses OpenAI's models.
Agentic tool- Pricing
- Included with ChatGPT: Go $8, Plus $20, Pro from $100 per month; Business and Enterprise by plan; API key billed per token.
- Best for
- ChatGPT subscribers who write code
Claude Code vs OpenAI Codex: feature-by-feature comparison.
Every row is drawn from the sources listed below. Rows that differ are marked, and you can filter the table to show only those.
- YesDocumented
- PartialAvailable with limits or on some plans
- NoDocumented as unavailable
- UnknownNot documented in the sources reviewed
| Dimension |  Claude Code |  OpenAI Codex |
|---|---|---|
| Product | ||
| Primary interface | YesTerminal CLI first, plus VS Code and JetBrains extensions, a desktop app and the web. | YesCLI, IDE extension, desktop app, web and iOS. |
| Model choiceDiffers | PartialClaude models from Anthropic. | NoOpenAI models. |
| Open-source statusDiffers | UnknownLicence not reviewed for this profile. | PartialThe CLI is described as open source (Apache-2.0) by third-party guides. |
| Pricing | ||
| Free tierDiffers | UnknownNo free tier identified in the sources reviewed. | YesLimited access via ChatGPT Free and Go plans. |
| Pricing model | YesIncluded in paid Claude plans, or usage-based API billing. | YesIncluded in ChatGPT plans, or per-token API billing. |
| Published plan prices reviewedDiffers | UnknownPlan prices were not reviewed for this profile. | YesGo $8, Plus $20, Pro $100 or $200 per month, per OpenAI's pages and help articles. |
| Agents | ||
| Cloud or remote agents | YesClaude Code on the web. | YesDelegated tasks in Codex cloud environments. |
| Extensibility | ||
| MCP, skills and hooksDiffers | YesMCP, hooks, skills, plugins and subagents. | UnknownNot reviewed for this profile. |
| Control | ||
| Documented approval and oversight controlsDiffers | YesPermissions, sandboxing and checkpoints documented. | UnknownNot documented in the sources reviewed. |
| Administration | ||
| Organisation and admin controls | PartialManaged settings via MDM and SSO under Claude for Enterprise, per a third-party summary. | PartialEnterprise and security admin guides and Compliance API logging are documented. |
Claude Code vs OpenAI Codex pricing.
Claude Code pricing
Included in paid Claude plans (Pro, Max, Team, Enterprise), or usage-based through an API key or a chosen cloud provider.
- Claude ProNot recorded
- Claude MaxNot recorded
- Team and EnterpriseNot recorded
- API or cloud provider billingUsage-based
Structure only; figures not recorded. Checked 15 Oct 2026.
All Claude Code plans and sources
OpenAI Codex pricing
Included with ChatGPT plans, with usage limits that vary by plan. API-key use is billed per token at OpenAI API rates, and eligible users can buy credits after reaching limits.
- FreeFree
- Go$8 per month
- Plus$20 per month
- Pro$100 or $200 per month
- Business, Enterprise and EduCustom or per seat
Figures reported consistently by independent sources; vendor page not reviewed directly. Checked 4 Nov 2026.
All OpenAI Codex plans and sourcesClaude Code: Included with paid Claude plans, or usage-based via API billing.
OpenAI Codex: Included with ChatGPT: Go $8, Plus $20, Pro from $100 per month; Business and Enterprise by plan; API key billed per token. Prices and allowances change often, so confirm on each vendor's live page.
Prices and plans change. Confirm current terms with each vendor before you decide.
Claude Code vs OpenAI Codex: implementation, ecosystem, AI and security.
Ease of implementation and usability
We did not test setup or onboarding effort. Evaluate both tools on a real branch of your own repository, with your own tests and conventions.
Integrations and ecosystem
Claude Code: MCP servers, VS Code and JetBrains, GitHub Actions, Git worktrees. OpenAI Codex: GitHub code review, Slack, VS Code and JetBrains IDE extensions, TypeScript SDK and GitHub Action.
AI capabilities
Model choice: Claude Code - Claude models from Anthropic. OpenAI Codex - OpenAI models.
Security, deployment and administration
Approval and admin controls: Claude Code - Permissions, sandboxing and checkpoints documented. OpenAI Codex - Not documented in the sources reviewed. Certifications and data-retention terms were not reviewed for either product; check each vendor's security documentation.
Claude Code and OpenAI Codex: each option, in balance.
Claude Code
Strengths and limitations from the profile
- Runs in the terminal, VS Code, JetBrains, a desktop app and the web, so one tool can follow a developer across environments.
- Anthropic documents a permission system used with sandboxing, plus checkpoints, which gives teams concrete oversight controls to evaluate.
- Extensible through MCP servers, hooks, skills, plugins and subagents with their own context windows.
- A CLAUDE.md file lets teams give the tool persistent project instructions that load every session.
- The documentation reviewed describes Claude models only, so teams wanting a choice of model vendors may prefer a multi-vendor product.
- Subscription usage is limited and measured in rolling five-hour and weekly windows, which heavy users should plan for.
- No free tier was identified in the sources reviewed, so evaluation requires a paid plan or API usage.
- Pricing was not reviewed on Anthropic's own pricing pages for this profile, so cost comparisons need a check of the live page.
OpenAI Codex
Strengths and limitations from the profile
- Included with ChatGPT plans, so existing subscribers do not pay for a separate product.
- Runs in the CLI, IDE, web and iOS from one account.
- Offers an API-key route billed per token for developers who prefer usage-based pricing.
- Documents an SDK, GitHub Action and enterprise and security admin guides.
- Supports OpenAI's models rather than several vendors' models.
- API-key use does not include cloud-based features such as GitHub code review and Slack.
- Pricing and usage measurement changed during 2026, so published guides go stale quickly.
- Human-approval and permission controls were not reviewed in the sources used here.
Claude Code or OpenAI Codex: which fits which situation?
No overall winner is declared. The better choice depends on the criteria that matter most to you, so test both against your own requirements.
Choose Claude Code if you…
- Terminal-first developers
- Teams that want documented permission and sandbox controls
- Workflows that use subagents, MCP integrations or CI automation
Choose OpenAI Codex if you…
- ChatGPT subscribers who write code
- Teams that want cloud task delegation and automated review
- Developers who want an open-source-style CLI with OpenAI models
Switching between Claude Code and OpenAI Codex.
Moving between Claude Code and OpenAI Codex means re-creating project instructions and rules, re-adding MCP servers or other tool connections, and adjusting how your team reviews agent output. Trying each on a separate branch before committing is a low-risk way to compare them.
- Export a sample of your data and test an import into the other product.
- List the automations, integrations and permissions you would need to rebuild.
- Pilot with one team before a full cut-over.
- Check contract terms and notice periods with both vendors.
General guidance, not specific to either vendor. Confirm migration options with the vendors.
Claude Code vs OpenAI Codex: questions and answers
Is Claude Code or OpenAI Codex better?
The sources reviewed do not support a single ranking. The better choice depends on interface preference, model needs, oversight requirements and budget, so test both on your own repository.
Does Claude Code have a free plan?
No free tier identified in the sources reviewed.
Does OpenAI Codex have a free plan?
Limited access via ChatGPT Free and Go plans.
Which supports more models, Claude Code or OpenAI Codex?
Claude Code: Claude models from Anthropic. OpenAI Codex: OpenAI models.
Where this comparison comes from.
- Claude Code documentation map Anthropic (code.claude.com) Official docs Accessed 15 Oct 2026
- Claude Code: AI harness overview innFactory AI Third-party Accessed 15 Oct 2026 Third-party summary of Anthropic's documentation, used for access and data-handling details.
- Codex Pricing OpenAI Developers Official docs Accessed 4 Nov 2026
- Codex quickstart OpenAI Developers Official docs Accessed 4 Nov 2026
Comparison rows summarise the sources listed and the two profiles. Confirm current details with each vendor. Stack18 has not tested either product.
Ready to test Claude Code and OpenAI Codex?
Check each vendor's current pricing and terms, run both against a real scenario from your business, or talk to Stack18 if off-the-shelf software is not the answer.
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