Codex (OpenAI) vs GitHub Copilot
Which one should you pick? Here's the full breakdown.
Codex (OpenAI)
OpenAI's cloud-based coding agent -- runs parallel tasks, proposes PRs, and lives inside ChatGPT
Powered by GPT-5.3-Codex / GPT-5.4
GitHub Copilot
AI code assistant that lives in your editor -- autocomplete on steroids
Powered by GPT-5.4
| Category | Codex (OpenAI) | GitHub Copilot |
|---|---|---|
| Ease of Use | 8.0 | 9.0 |
| Output Quality | 8.0 | 8.0 |
| Value | 8.0 | 8.0 |
| Features | 9.0 | 8.0 |
| Overall | 8.3 | 8.3 |
Pricing Comparison
| Feature | Codex (OpenAI) | GitHub Copilot |
|---|---|---|
| Free Tier | Yes | Yes |
| Starting Price | $0 | $0 |
Benchmark Head-to-Head
GPT-5.3-Codex benchmarks — GitHub Copilot has no published benchmarks
| Benchmark | Description | Score |
|---|---|---|
| SWE-bench | Real GitHub issue fixing | 72% |
| HumanEval | Python code generation | 95% |
Which Should You Pick?
Pick Codex (OpenAI) if...
- ✓More features (9 vs 8)
Developers already paying for ChatGPT Plus who want a coding agent at no extra cost. Especially good for parallel task execution -- assign multiple bug fixes or feature branches and let Codex work them simultaneously.
Visit Codex (OpenAI)Pick GitHub Copilot if...
- ✓Easier to use (9 vs 8)
Any developer who wants productivity gains without changing their workflow. It works in your existing editor and the inline suggestions are the best in the business.
Visit GitHub CopilotOur Verdict
Codex (OpenAI) and GitHub Copilot are extremely close overall. Your choice comes down to specific needs -- Codex (OpenAI) is better for developers already paying for chatgpt plus who want a coding agent at no extra cost, while GitHub Copilot works best for any developer who wants productivity gains without changing their workflow.