OpenAI Codex CLI vs Devin — Which AI Agent Is Better?
An in-depth comparison of OpenAI Codex CLI and Devin across output quality, autonomy, reliability, speed, value, and ease of use. Vote for your favorite.
An in-depth comparison of OpenAI Codex CLI and Devin across output quality, autonomy, reliability, speed, value, and ease of use. Vote for your favorite.
Pick a winner in each category — you can change your vote anytime. 7 votes cast so far.
CodexDevinChoose OpenAI Codex CLI if you are chatGPT subscribers who want a capable terminal agent at no extra cost. Choose Devin if you are teams that want to delegate well-scoped engineering tickets end-to-end.
In our editorial scoring, OpenAI Codex CLI leads in 4 of six categories (output quality, reliability, speed and value), while Devin leads in 2 (autonomy and ease of use). On price, OpenAI Codex CLI runs included with chatgpt plans / api and is open source; Devin runs $20/mo entry + usage (acus) and is proprietary.
Across 7 community votes on this matchup, Devin currently leads in 6 of six categories. Cast your own vote above to move the needle.
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Weighing the cost of running it? Compare API plans for Codex
Codex CLI is OpenAI's open-source coding agent for the terminal. It edits files, runs commands in a sandbox with configurable approval modes, and can hand longer tasks off to Codex cloud to run in the background. Usage is included with ChatGPT Plus/Pro plans, making it the default choice for developers already in the OpenAI ecosystem.
Devin is Cognition's fully autonomous software engineer: give it a task in Slack, Linear, or the web IDE and it plans, writes code, runs tests, and opens a pull request in its own cloud sandbox — including several sessions in parallel. It shines on well-scoped, repetitive engineering work (migrations, test coverage, small features) and improved markedly through its 2.x releases, but it remains weaker on ambiguous, novel tasks, and ACU-based usage pricing means heavy use costs real money. Cognition also acquired Windsurf in 2025, folding its IDE technology into the same product family.
OpenAI Codex CLI runs on Standard Compute
