ChatGPT vs Codex: Side-by-Side Comparison 2026
ChatGPT vs Codex comparison for 2026. Features, pricing, AI capabilities, and editor support analyzed side by side to help you choose the right coding tool for your workflow.
ChatGPT is an AI assistant from OpenAI — ai assistant with powerful coding capabilities. Codex is an AI agent and a CLI-based coding agent from OpenAI — asynchronous autonomous coding agent.
ChatGPT
ChatGPT. Conversational AI from OpenAI. General + Coding.
- ✓ AI chat
- ✓ Test generation
- ✓ Debugging
- ✓ Code review
Free / $8/mo · 7 plans
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
| Feature | ChatGPT | Codex |
|---|---|---|
| Category | Assistant | Agent / CLI |
| Starting Price | Free | Free |
| Model Family | GPT / o-series | GPT / Codex |
| Agentic Mode | — | ✓ |
| Multi-File Editing | — | ✓ |
| Terminal Commands | — | ✓ |
| Voice Input | ✓ | — |
| Git Integration | — | ✓ |
| Open Source | No | Yes (CLI) |
Pricing verified May 4, 2026. ChatGPT pricing | Codex pricing
Key Differences
- Category: ChatGPT is an AI assistant; Codex is an AI agent and a CLI-based coding agent.
- Model family: ChatGPT uses GPT / o-series; Codex uses GPT / Codex.
- Agentic mode: Codex supports agentic mode; ChatGPT does not.
- Open source: ChatGPT: No. Codex: Yes (CLI).
- Bring your own key: Codex supports BYOK; ChatGPT does not.
- Platforms: ChatGPT runs on Android, Web, Windows, iOS, macOS; Codex runs on Linux, Web, Windows (experimental), macOS.
- Capabilities: Codex has multi-file editing; Codex has terminal commands; ChatGPT has voice input.
Which Should You Choose?
Choose ChatGPT if you want AI-powered coding assistance. Choose Codex if you want asynchronous coding tasks you can fire off and review when ready. Read our full reviews to see which fits your workflow.