Devin vs OpenAI Codex
Cognition's fully autonomous AI software engineer. You assign a ticket and Devin plans, codes, tests and ships it in its own cloud environment, working through a backlog of well-defined tasks like a junior developer.
🧠 Expert verdict
Our expert verdict: OpenAI Codex is the stronger all-round choice, scoring 4.8/5 versus 4.3/5 for Devin, and it stands out for "Top Terminal-Bench score (~83% on GPT-5.5)". Choose OpenAI Codex if you want the best code tool overall, especially for autonomous feature development; pick Devin if "Fully autonomous end-to-end on a ticket" matters more for your workflow.
Devin
Cognition's fully autonomous AI software engineer. You assign a ticket and Devin plans, codes, tests and ships it in its own cloud environment, working through a backlog of well-defined tasks like a junior developer.
OpenAI Codex
OpenAI's autonomous coding agent powered by the GPT-5 family. It reads your codebase, writes and edits code, runs tests and opens pull requests — and can run several tasks in parallel from the CLI, VS Code, web or mobile.
Devin
✅ Pros
- +Fully autonomous end-to-end on a ticket
- +Own cloud workspace with browser & terminal
- +Great for large backlogs of defined tasks
- +Slack and IDE integrations
- +Parallelizes across many tasks
❌ Cons
- −No free tier
- −Usage-based ACU pricing adds up fast
- −Best value only when kept constantly busy
- −Struggles on ambiguous or novel work
OpenAI Codex
✅ Pros
- +Top Terminal-Bench score (~83% on GPT-5.5)
- +Unique parallel task execution
- +Included in every ChatGPT plan
- +VS Code, CLI, web, iOS and Slack
- +Automatic PR code review
❌ Cons
- −Heavy use can cost $100-200/dev per month
- −Credit burn scales with repo size
- −Best models gated to Pro tiers
- −Cloud sandbox model not for everyone
🎯 Best for — Devin
🎯 Best for — OpenAI Codex
🏷️ Tags — Devin
🏷️ Tags — OpenAI Codex
Our Verdict
After comparing ratings, pricing and features, OpenAI Codex comes out ahead with a 4.8/5 rating. It is the better choice for most users.
Expert take on each tool
📌 Devin
Devin is worth it for teams with a large backlog of well-scoped tickets who can keep it busy. For most individuals, an agent like Claude Code or Codex at $20/mo offers stronger reasoning per dollar — Devin shines on volume, not on novel problem solving.
📌 OpenAI Codex
Codex is the best choice for teams already inside the OpenAI/ChatGPT ecosystem who want a top-tier autonomous agent that can fire off several tasks in parallel and open pull requests. It leads most agentic coding benchmarks, but heavy usage gets expensive.
❓ Frequently Asked Questions
Which is better: Devin or OpenAI Codex?
OpenAI Codex has the higher user rating (4.8/5 vs 4.3/5), making it the stronger overall pick. That said, Devin can still be the better fit depending on your budget and specific needs — see the full comparison above.
Is Devin or OpenAI Codex cheaper?
OpenAI Codex (In ChatGPT: Free / Plus $20/mo / Pro from $100/mo) is generally more budget-friendly than Devin (From $20/mo (ACU usage) / Team $500/mo). If cost is your main concern, OpenAI Codex is worth trying first — but compare the feature sets above to confirm it covers what you need.
Can I switch from Devin to OpenAI Codex?
Yes — switching between Devin and OpenAI Codex is usually straightforward since both are code tools with similar core workflows. Most users can export their data and get started with OpenAI Codex within a day; just check OpenAI Codex's free plan before committing to a paid tier.