# GitHub Copilot vs OpenAI Codex (2026): Which should you pick?

> Short answer: Pick GitHub Copilot if you work on GitHub and want issue-to-PR agents and code review, starting from a free tier. Pick OpenAI Codex if you already use ChatGPT and want parallel cloud agents through the CLI, IDE extension or ChatGPT app.
> Facts from official pages, checked 2026-11-03. No scores and no hands-on testing.

- Canonical page: https://usewhichtool.com/compare/github-copilot-vs-openai-codex
- Last verified: 2026-11-03
- Publisher: Use Which Tool (https://usewhichtool.com), run by Sameer Chowdhry
- Cite as: Use Which Tool, "GitHub Copilot vs OpenAI Codex (2026): Which should you pick?", https://usewhichtool.com/compare/github-copilot-vs-openai-codex (last verified 2026-11-03)

## Short answer

- Pick GitHub Copilot if you work on GitHub and want issue-to-PR agents and code review, starting from a free tier.
- Pick OpenAI Codex if you already use ChatGPT and want parallel cloud agents through the CLI, IDE extension or ChatGPT app.

## Verdicts

- GitHub Copilot: The low-friction pick if you already use GitHub.
- OpenAI Codex: A strong pick if you already pay for ChatGPT.

## Side by side

| | GitHub Copilot | OpenAI Codex |
| --- | --- | --- |
| Pricing | Free; Pro $10/mo; Pro+ $39/mo; Max $100/mo. Each plan includes monthly GitHub AI Credits for chat and agents (Pro $15, Pro+ $70, Max $200 in credits); code completions stay unlimited on paid plans. | Free plan includes Codex with lower limits; Go $8/mo; Plus $20/mo; Pro $100, $200 or $500/mo; Business $20/user/mo (2+ users, annual; $25 monthly); Enterprise and Edu via sales. Codex shares one usage allowance with ChatGPT Work. |
| Price type | Free tier | Free tier |
| Pricing source | https://github.com/features/copilot/plans | https://learn.chatgpt.com/docs/pricing |
| Verified | 2026-11-03 | 2026-11-03 |
| Use cases | autocomplete code; AI pull request review; assign issues to a coding agent; chat about a repo | cloud coding agents; automated PR review; coding in terminal or IDE |
| Strengths | Deep GitHub integration from issue to PR review; Works in editors, terminal, desktop and on GitHub; Free tier available | Included in ChatGPT plans; Runs parallel agents in the cloud; CLI, IDE extension and ChatGPT app |
| Limitations | Best value if your code already lives on GitHub; Higher usage requires upper tiers | Usage tied to ChatGPT plan limits, shared with ChatGPT Work; Best experience requires ChatGPT account |
| Official site | https://github.com/features/copilot | https://openai.com/codex |

Tool pages: [GitHub Copilot](https://usewhichtool.com/tools/github-copilot) · [OpenAI Codex](https://usewhichtool.com/tools/openai-codex)

## Questions

### Should I use GitHub Copilot or OpenAI Codex?

Pick GitHub Copilot if you work on GitHub and want issue-to-PR agents and code review, starting from a free tier. Pick OpenAI Codex if you already use ChatGPT and want parallel cloud agents through the CLI, IDE extension or ChatGPT app. Based on the official pricing pages and docs listed on this page, checked 2026-11-03.

### Is GitHub Copilot free?

Yes, it lists a free way to start. Free; Pro $10/mo; Pro+ $39/mo; Max $100/mo. Each plan includes monthly GitHub AI Credits for chat and agents (Pro $15, Pro+ $70, Max $200 in credits); code completions stay unlimited on paid plans. (official pricing page, checked 2026-11-03)

### Is OpenAI Codex free?

Yes, it lists a free way to start. Free plan includes Codex with lower limits; Go $8/mo; Plus $20/mo; Pro $100, $200 or $500/mo; Business $20/user/mo (2+ users, annual; $25 monthly); Enterprise and Edu via sales. Codex shares one usage allowance with ChatGPT Work. (official pricing page, checked 2026-11-03)

### How much do GitHub Copilot and OpenAI Codex cost?

GitHub Copilot: Free; Pro $10/mo; Pro+ $39/mo; Max $100/mo. Each plan includes monthly GitHub AI Credits for chat and agents (Pro $15, Pro+ $70, Max $200 in credits); code completions stay unlimited on paid plans. OpenAI Codex: Free plan includes Codex with lower limits; Go $8/mo; Plus $20/mo; Pro $100, $200 or $500/mo; Business $20/user/mo (2+ users, annual; $25 monthly); Enterprise and Edu via sales. Codex shares one usage allowance with ChatGPT Work. (official pricing pages, checked 2026-11-03).

### What is the difference between GitHub Copilot and OpenAI Codex?

GitHub Copilot is listed for: autocomplete code; aI pull request review; assign issues to a coding agent; chat about a repo. OpenAI Codex is listed for: cloud coding agents; automated PR review; coding in terminal or IDE.

### Is GitHub Copilot free for students?

Yes. Verified students get Copilot Student for free, with unlimited code completions and an allowance of AI credits (models through auto selection only). Verified teachers and maintainers of popular open source projects can get Copilot Pro for free. Source: GitHub Docs: Copilot plans (https://docs.github.com/en/copilot/get-started/plans); GitHub Docs: Copilot billing for individuals (https://docs.github.com/en/copilot/concepts/billing-and-usage/individuals/billing); GitHub Docs: Free Copilot Pro for teachers and maintainers (https://docs.github.com/en/copilot/how-tos/manage-your-account/get-free-access-to-copilot-pro).

### What are GitHub AI Credits in Copilot?

They are how Copilot bills features that use AI models, such as Copilot Chat, Copilot CLI and the cloud agent: 1 AI credit is $0.01. Pro ($10/mo) includes 1,500 credits a month, Pro+ ($39/mo) 7,000 and Max ($100/mo) 20,000. Code completions and next edit suggestions do not use credits and stay unlimited on paid plans. The free plan includes 2,000 code completions a month. Source: GitHub Docs: Copilot billing for individuals (https://docs.github.com/en/copilot/concepts/billing-and-usage/individuals/billing).

### Is Codex included with ChatGPT Plus?

Yes. Codex is included in ChatGPT Free, Go, Plus, Pro, Business, Edu and Enterprise, and it shares usage with ChatGPT Work. Plus usage is measured per five-hour period and weekly limits may also apply; Pro plans currently have no five-hour limit. Plus and Pro users who reach their limit can buy more credits, and anyone can run extra local chats with an API key at API rates. Source: OpenAI docs: ChatGPT Work and Codex pricing (https://learn.chatgpt.com/docs/pricing).

### Did you test GitHub Copilot and OpenAI Codex?

No. Verdicts are based on each vendor's public docs and pricing pages, not hands-on testing, unless a page says otherwise.

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