Comparison
Devin vs OpenAI Codex
Devin: Autonomous software engineer that works whole tasks unsupervised. OpenAI Codex: OpenAI's coding agent, included with ChatGPT.
| Devin | OpenAI Codex | |
|---|---|---|
| Rating | 4.1 | 4.5 |
| Price | Paid Core from $20/month with ACU-based usage (around $2.25/ACU). Team $500/month with 250 ACUs included. Enterprise on quote. | Freemium Limited use on the free ChatGPT plan. Go $8/month, Plus $20/month, Pro $100-200/month, Business $25/user/month. Since April 2026 it bills against token credits. |
| Free plan | ||
| API available | ||
| Open source | ||
| In Spanish | ||
| No watermark | — | — |
| Platforms | Web | Web · Windows · Mac · Linux · iOS |
Devin
- Works complete tasks without constant supervision
- Its own environment with browser and terminal: it never touches your machine
- Dropped 96% in price: entry at $20/month
- ACU usage escalates quickly on long tasks
- It fails on ambiguous or poorly specified problems
OpenAI Codex
- Included in the ChatGPT subscription you already pay for
- Its CLI is open source and accepts your own API key
- Works in the cloud on several tasks at once
- Since April 2026 it bills against token credits: hard to predict
- Real heavy usage runs to $100-200 a month per developer