Codex vs Google Gemini: Side-by-Side Comparison 2026
Codex vs Google Gemini comparison 2026. Side-by-side features, pricing & capabilities.
Codex is an AI agent and a CLI-based coding agent from OpenAI — asynchronous autonomous coding agent. Google Gemini is an AI assistant from Google — google's ai assistant with coding capabilities.
Codex🏆 Approved
OpenAI's autonomous coding agent. Available via web, desktop app (macOS), CLI (macOS/Linux/Windows), and VS Code extension.
- ✓ Code completions
- ✓ AI chat
- ✓ Agentic mode
- ✓ Multi-file editing
- ✓ Terminal commands
Free / $8/mo · 6 plans
Google Gemini
Google Gemini is Google's AI assistant powered by Gemini models. A Google AI Pro or Ultra subscription unlocks access to Jules, Gemini CLI, Gemini Code Assist, Firebase Studio, and Google Antigravity.
- ✓ Conversational AI for code generation
- ✓ Image-to-code from screenshots
- ✓ Voice input for coding questions
- ✓ Code explanation and debugging
- ✓ Multi-language code generation
Free / $7.99/mo · 4 plans
| Feature | Codex | Google Gemini |
|---|---|---|
| Category | Agent / CLI | Assistant |
| Starting Price | Free | Free |
| Model Family | GPT / Codex | Gemini |
| Agentic Mode | ✓ | — |
| Multi-File Editing | ✓ | — |
| Terminal Commands | ✓ | — |
| Voice Input | — | ✓ |
| Git Integration | ✓ | — |
| Open Source | Yes (CLI) | No |
Pricing verified Feb 25, 2026. Codex pricing | Google Gemini pricing
Key Differences
- Category: Codex is an AI agent and a CLI-based coding agent; Google Gemini is an AI assistant.
- Starting price: Codex starts at $8/mo; Google Gemini starts at $7.99/mo.
- Model family: Codex uses GPT / Codex; Google Gemini uses Gemini.
- Agentic mode: Codex supports agentic mode; Google Gemini does not.
- Open source: Codex: Yes (CLI). Google Gemini: No.
- Bring your own key: Codex supports BYOK; Google Gemini does not.
- Platforms: Codex runs on Linux, Web, Windows (experimental), macOS; Google Gemini runs on Android, Web, iOS, macOS.
- Provider: Codex is built by OpenAI; Google Gemini is built by Google.
- Capabilities: Codex has multi-file editing; Codex has terminal commands; Google Gemini has voice input.
Which Should You Choose?
Choose Codex if you want asynchronous coding tasks you can fire off and review when ready. Choose Google Gemini if you want a great-value subscription with multiple coding tools included. Read our full reviews to see which fits your workflow.