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OpenAI Codex vs Gemini Code Assist
OpenAI Codex scores higher overall (8.7 vs 6.9), but the right pick depends on what you need.
Choose OpenAI Codex if…
Developers who want parallel, asynchronous tasks and pull requests back, bundled with ChatGPT
8.7/10★★★★★Full review →Choose Gemini Code Assist if…
Teams standardised on Google Cloud who want a managed, enterprise-licensed assistant
6.9/10★★★★★Full review →Side by side
| OpenAI Codex | Gemini Code Assist | |
|---|---|---|
| Overall score | 8.7/10 | 6.9/10 |
| Rank in category | #1 of 13 | #11 of 13 |
| Price | Freemium · from $8/month | Paid · from $19/user/month |
| Free version | Quick coding tasks on ChatGPT Free | — |
| Platforms | Web, iOS, VS Code, Terminal, Desktop app | VS Code, JetBrains, Terminal, Other |
| Made by | OpenAI | |
| Code quality | 9 | 7 |
| Ease of use | 8 | 7 |
| Features | 8.5 | 7.5 |
| Value for money | 9 | 6 |
| Platforms | 9 | 7 |
OpenAI Codex: what the AI does
- Cloud agent in sandboxed machines that delivers pull requests
- Open-source Codex CLI
- IDE extension and desktop app with multi-agent management
- Automatic GitHub code review
- Subagents, skills, hooks and MCP
- Codex Security vulnerability agent
- Top CLI agent on Terminal-Bench 2.0
- Low entry price, with free and $8 tiers
- Many surfaces: web, CLI, IDE, desktop, iOS
- Open-source CLI
- Async cloud tasks add latency for quick edits
- Only OpenAI models
- Free and Go tiers get a lighter model
Gemini Code Assist: what the AI does
- Code completion and full function/file generation
- Agent mode with multi-file edits and MCP
- Terminal agent
- Automated GitHub pull request reviews
- Very large context; Enterprise connects private repos
- Deep Google Cloud, Firebase and Android Studio integration
- Very large context window
- GitHub pull request review agent
- Enterprise customisation on private code
- Free individual tier discontinued in June 2026
- Confusing product line (Code Assist vs Antigravity)
- Fewer independent reviews than the leaders