Devin vs OpenAI Codex

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors.

The short answer

Cheaper paid plan: OpenAI Codex — $8/mo vs $20/mo for Devin
Free plan: Both have one
Public API: Both have one
Best fit: Devin: Engineering teams delegating well-specified tickets such as migrations, test coverage and dependency upgrades · OpenAI Codex: ChatGPT subscribers who want a coding agent included in their plan
Platforms: Devin: Web, macOS, Slack app · OpenAI Codex: Web, macOS, Windows, Linux, iOS, VS Code extension

From our own records as of each tool's last check. Anything we have not confirmed is left out rather than guessed. How we verify

DevinAutonomous software engineer working in a cloud VM

OpenAI CodexOpenAI's coding agent for the terminal, IDE, desktop and cloud sandboxes, included with ChatGPT plans or billed by API tokens.

Side by side

Fact	Devin	OpenAI Codex
Category	AI Code Editors & IDEs	AI Coding Assistants
Pricing model	Freemium	Freemium
Starts at	$20/mo	$8/mo
Public API	Yes	Yes
Trust score	84 / 100	84 / 100
Platforms	Web, macOS, Slack app, API	Web, macOS, Windows, Linux, iOS, VS Code extension, API
Company	Cognition AI, Inc.	OpenAI
Launched	—	2025
Last verified	Sep 6, 2026	Oct 2, 2026

What our research says

Devin

Devin is the agent to hand a whole ticket to and walk away from, and the $20 Pro tier makes that affordable to try for the first time. The quota is the catch: a long autonomous session can exhaust a plan quickly, and once it does you are paying API rates, so it suits teams that batch well-scoped tasks rather than developers who want a tireless pair programmer in the loop.

Pros

End-to-end autonomy: plans, codes, tests and opens the pull request from its own cloud machine
Fans one large task out across parallel agents and manages them itself
Native Slack, Linear, Jira and GitHub integration plus Desktop and CLI clients
Entry price dropped to $20 a month, far below the original enterprise-only positioning

Cons

Quotas are described only qualitatively ('light', 'generous'), so cost per task is hard to predict
Overage is billed at API pricing, which is where a runaway agent session gets expensive
Team tier adds a flat $80 a month on top of $40 per full user
Pages are heavily client-rendered; the terms live on cognition.com, not devin.ai

OpenAI Codex

Codex is the obvious pick if you already pay for ChatGPT and want an agent that can work in your terminal or off in a cloud sandbox without a second subscription. It is less compelling if you want a polished editor-native experience or need predictable monthly spend at heavy usage.

Pros

The command-line agent is open source under Apache-2.0
Free and Go tiers let you try it before paying for a bigger plan
Same agent is reachable from terminal, IDE extension, desktop app and cloud tasks
Can sign in with a ChatGPT plan or an API key, whichever billing suits you

Cons

Usage limits on subscription plans vary by model, task and local versus cloud runs, so capacity is hard to predict
Top-tier usage requires the higher Pro plans, which start at $100/month
Surfaces and plan names change often, so docs and pricing pages move around

Which one fits

Choose Devin if you need

Engineering teams delegating well-specified tickets such as migrations, test coverage and dependency upgrades
Organisations that want agents assigned from Slack, Linear or Jira and reviewed as pull requests
Large codebases where a task can be fanned out across parallel cloud agents

Choose OpenAI Codex if you need

ChatGPT subscribers who want a coding agent included in their plan
Developers delegating well-scoped tasks and reviewing the resulting diffs
Teams that want automated pull-request review in GitHub