Codex vs Devin: Side-by-Side Comparison 2026
Codex vs Devin 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. Devin is an AI agent from Cognition — fully autonomous ai software engineer.
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
Devin
Autonomous AI coding agent by Cognition. Handles full development tasks end-to-end. Cognition also owns Windsurf, integrating IDE and agent workflows.
- ✓ AI chat
- ✓ Agentic mode
- ✓ Multi-file editing
- ✓ Terminal commands
- ✓ Test generation
$20/mo · 3 plans
| Feature | Codex | Devin |
|---|---|---|
| Category | Agent / CLI | Agent |
| Starting Price | Free | $20/mo |
| Model Family | GPT / Codex | Proprietary |
| Open Source | Yes (CLI) | No |
Pricing verified Feb 25, 2026. Codex pricing | Devin pricing
Key Differences
- Category: Codex is an AI agent and a CLI-based coding agent; Devin is an AI agent.
- Free tier: Codex has a free tier; Devin does not.
- Starting price: Codex starts at $8/mo; Devin starts at $20/mo.
- Model family: Codex uses GPT / Codex; Devin uses Proprietary.
- Open source: Codex: Yes (CLI). Devin: No.
- Bring your own key: Codex supports BYOK; Devin does not.
- Platforms: Codex runs on Linux, Web, Windows (experimental), macOS; Devin runs on Web.
- Provider: Codex is built by OpenAI; Devin is built by Cognition.
Which Should You Choose?
Choose Codex if you want asynchronous coding tasks you can fire off and review when ready. Choose Devin if you want fully autonomous engineering tasks with minimal supervision. Read our full reviews to see which fits your workflow.