ChatGPT vs Codex: Side-by-Side Comparison 2026
ChatGPT vs Codex comparison 2026. Side-by-side features, pricing & capabilities.
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 · 6 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 Feb 25, 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.