OpenAI's terminal-based coding agent. Codex CLI brings AI-powered code generation, editing, and analysis directly to your terminal with a natural language interface. It supports multiple AI models, runs locally, and integrates seamlessly with git workflows.
Cognition AI's autonomous AI software engineer
Codex CLI vs Devin: Which Is Better in 2026
I've been testing AI coding assistants since GitHub Copilot was a baby, and let me tell you—2026 is a weirdly wonderful time. We've got two serious contenders that aren't just autocomplete on steroids: Codex CLI from OpenAI and Devin from Cognition AI. I've spent the last three months putting both through their paces on real projects, and here's what I actually found.
Codex CLI is OpenAI's terminal-native answer to 'what if'
# I Spent 40 Hours with Devin (Cognition's AI Engineer) – Here's What Actually Works I've been burned by enough "AI that writes code" promises to be skeptical. When I first got access to Devin, Cogni
# I Broke My CI/CD Pipeline on Purpose—Here's How Devin Fixed It (and Where It Failed) I’ve been running a modest SaaS app on AWS for three years. My CI/CD pipeline was a Frankenstein of GitHub Actio