Devin, Cursor, and Codex | 매거진에 참여하세요

Can AI Really Free Developers from Coding?

Since 2023, AI coding tools have moved far beyond autocomplete.

Today, they’re reaching for a far more ambitious goal: executing full-stack software development autonomously.

Among the rising stars, Devin by Cognition, Cursor, and OpenAI’s Codex have each taken unique approaches to redefining how developers work.

In this article, we’ll compare these three tools

—highlighting their philosophies, capabilities, limitations, and their potential to reshape the developer ecosystem.

Devin: The World’s First AI Software Engineer

Remember that viral demo from early 2024? The one where an AI “engineer” named Devin handled entire software projects solo?

Developed by Cognition and launched in March 2024,

Devin was positioned not just as a coding assistant—but as a fully autonomous software developer,

capable of everything from planning to deployment.

Highlights:

• - Works inside a web-based IDE

• - Accepts natural language commands to initiate end-to-end software tasks

• - Searches and integrates external libraries as needed

• - Visualizes work progress through an interactive GUI

Devin can generate a task roadmap from user prompts, execute each step, debug in real time, and adapt on the fly.

It behaves like a diligent (if slightly green) junior developer.

Strengths:

• - High autonomy: You give it a goal; it figures out the path.

• - Efficient at repetitive and structured tasks like building APIs or automating data collection

Limitations:

• - Doesn’t always grasp broader project context

• - Not ideal for complex UI work or collaborative team workflows

• - Code quality and documentation still benefit from human oversight

Then Came Cursor: The AI-Powered IDE That Stole the Spotlight

Cursor was developed by Cursor.dev as a fork of VS Code—and it’s been surging in popularity.

While Devin aims for autonomy, Cursor positions itself as a context-aware, real-time collaborator.

Think “AI pair programmer” living inside your IDE.

Highlights:

• - Deep GPT-4 integration for live refactoring, debugging, and documentation

• - Conversational interface for code explanations and Q&A

• - Embedded directly in the editor for seamless assistance

Strengths:

• - Excels at local context understanding, offering both cause and solution

• - Rapid support for refactoring and test generation

• - Great for team workflows (e.g. Git diff explanations, PR support)

Limitations:

• - Limited to VS Code ecosystem; less useful for UI-heavy or non-code tasks

• - Suggestions require validation—AI doesn’t guarantee correctness

• - Extended reliance may hinder developer learning over time

Devin vs. Cursor: Two Philosophies, Two Use Cases

Devin is like an intern who tries to do it all. Cursor is a sharp, reliable teammate who plugs into your daily workflow.

Why Cursor Outpaced Devin

Despite Devin’s earlier debut, Cursor has become the frontrunner in real-world adoption. Here's why:

1. Devin is Still a Research Demo

Devin hasn’t officially launched as a SaaS product. Its IDE isn’t public, and it’s mostly known through demo videos.

There's no subscription model or stable deployment.

Cursor, on the other hand, is a full-fledged commercial SaaS platform with thousands of paid users.

Major companies have already integrated it into their engineering workflows.

2. Full Autonomy is Technically Hard

Building a tool that thinks and codes end-to-end brings serious complexity. Devin’s autonomy means:

• Recovery logic for debugging is tough

• Ensuring consistent code quality and test accuracy is challenging

As a result, many companies see it as “promising but risky.”

3. Real Developers Want Precision, Not Magic

Many devs don’t want an AI to replace their workflow—they want tools that enhance it.

Cursor meets that need. Its tight integration with VS Code supports daily developer rituals

—refactoring, reviewing, documenting—without reinventing the wheel.

OpenAI Codex: The Built-in Agent Inside ChatGPT

In May 2025, OpenAI introduced a new Codex Agent to ChatGPT Pro, Team, and Enterprise users.

Unlike Devin or Cursor, Codex is built inside ChatGPT—and acts like a development agent on command.

Highlights:

• - Runs in a secure sandbox within the ChatGPT web app

• - Executes full development tasks—directory changes, code generation, testing—via natural language prompts

• - No installation required

Strengths:

• - Seamlessly accessible from the ChatGPT UI

• - Handles the full cycle: generate, test, explain, and refine code

• - Already used by engineers at companies like Cisco, Temporal, Superhuman, and Kodiak

Limitations:

• - Still in preview, with sessions limited to 30 minutes

• - Operates in a closed environment—no external API access or internet browsing

Quick Comparison: Devin vs Cursor vs Codex

Final Thoughts

While Devin pioneered the vision of an autonomous AI engineer,

it’s Cursor that has delivered the most tangible value—especially for working developers.

And OpenAI’s Codex? It might just bridge the best of both worlds:

a flexible AI agent embedded into a familiar interface, ready to code on command.

In the end, it’s not just about who builds the most powerful AI.

It’s about who builds it for the right users, with the right workflow in mind.

#devin#cursor#codex#openai#coding#tool#comparison#timeline