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| What matters | 🤖 GitHub Copilot | 💻 OpenAI Codex |
|---|---|---|
| What it does | GitHub's AI coding tools for editor assistance, agents, code review, and issue-to-pull-request workflows. | OpenAI coding agent for cloud tasks, CLI, IDE extension and SDK, included in ChatGPT plans from Free to Enterprise. |
| Best for | Coding assistance in an existing GitHub development workflow | OpenAI Codex suits developers who want to delegate coding tasks to a cloud or local agent and review the result as a pull request. |
| Pricing model | Free plan + paid | Free plan + paid |
| Free-plan limits | Free provides limited chat and agent usage. Paid plans include larger allowances; agentic features consume GitHub AI Credits and can involve additional usage charges. | Codex is available on ChatGPT Free, Go, Plus, Pro, Business, Edu and Enterprise plans, with usage shared with ChatGPT. API-key access is billed at standard API pricing. Some features, such as computer use, are regionally limited on some plans, so check what your plan includes. |
| Platforms | Web | Web, macOS, Windows, Linux, iOS, API |
| Key capabilities | Editor coding assistance Agent mode CLI assistance Cloud agents on eligible plans Code review | Local and cloud task execution Sandboxing and permission controls GitHub pull request reviews Skills, plugins and MCP servers Subagents and scheduled tasks |
| Strengths | Coding assistance inside a repository can use the nearby implementation and test style. | Several ways to run it: cloud, CLI, IDE and SDK Available on a free ChatGPT plan with limits Review and delegation features for GitHub |
| Limitations | Free provides limited chat and agent usage. Paid plans include larger allowances; agentic features consume GitHub AI Credits and can involve additional usage charges. A suggested test can mirror a mistake; define the expected behavior independently. | Usage limits depend on plan and shared with ChatGPT Some features are region or plan limited |
| No signup required | Not verified | Not verified |
| No credit card required | Not verified | Not verified |
| Open source | Not verified | Not verified |
| Free trial | Not verified | Not verified |
| Access details reviewed | 2026-10-06 | 2026-10-15 |
| Official pricing / source | Check pricingAccess source | Check pricingAccess source |
| Next step | Explore GitHub Copilot | Explore OpenAI Codex |