Devin vs OpenAI Codex
Pricing
Devin: From $500/mo
OpenAI Codex: Included in ChatGPT plans (Plus $20/mo, Pro from $100/mo), limited use on Free and Go
Description
Devin: Autonomous AI software engineer that takes tasks, writes code, runs tests, and submits PRs on its own
OpenAI Codex: OpenAI's coding agent, which works in the ChatGPT desktop app, your terminal, your editor and the cloud on your ChatGPT plan
Pros
- Can work on tasks independently while you do other things
- Handles the full cycle: plan, code, test, debug, submit PR
- Learns your codebase conventions over time
- Runs in the ChatGPT desktop app, the CLI, an IDE extension and on the web, all tied to one ChatGPT account
- Cloud tasks keep going after you close your laptop, in a reusable environment for each repo
- Reviews GitHub pull requests when you tag @Codex or turn on automatic reviews
Cons
- $500/mo minimum makes this a serious commitment for a solo founder
- Results vary wildly: great for routine tasks, unpredictable for complex ones
- You still need to review its work carefully
- Free and Go plans only get limited use in the desktop app, on the smaller GPT-6 Luna model
- Plus usage is counted per five-hour window and weekly limits can also apply, and how far it goes depends on the model and the size of the task
- Running it on an API key instead of a plan drops the cloud features, such as GitHub code review and Slack
Details
Devin works more independently than most AI coding tools. You assign it a task (“fix this bug,” “add this feature,” “set up CI/CD”) and it goes away, works on it, and comes back with a pull request. You do not sit and watch; it works asynchronously.
The $500/month price tag is steep for solo founders, and that is the honest reality. The people getting value from Devin are those with more tasks than time, who can keep it busy with well-defined work. If you have 3 bug fixes and 2 small features to ship this week and cannot hire a developer, Devin might pay for itself. If you are pre-revenue and watching every dollar, this is not where you start.
Codex is OpenAI’s coding agent. You hand it a task, such as a hard-to-find bug, a refactor or a new feature, and it reads the code, makes the changes and checks its own work, using browser and computer tools where it needs them. It can run several agents in parallel, and cloud tasks carry on while your laptop is closed.
It comes with ChatGPT, so if you already pay for Plus you already have it. The same account works in the desktop app, the terminal, your editor and on iOS.
OpenAI describes Plus at $20/month as enough for a few focused coding sessions a week. Heavier use means Pro, from $100/month, which currently has no five-hour limit, or buying extra credits when you hit the limit. You can also run the CLI on an API key and pay standard API rates, which suits automation such as CI.
Devin verified
OpenAI Codex verified
