OpenAI Codex

Name: OpenAI Codex
Brand: OpenAI
Rating: 4.7 (5 reviews)

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Delegate coding tasks in plain language, get pull requests

AI Coding AI Agents Developer Tools

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4.7(5 across the web)

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Coverage fromTechRadarVentureBeatThe Next Web

5 reviews tracked·22 press mentions

The Bottom Line

Entry price

Free plan available, paid tiers above

Biggest con

Meaningful use requires a paid ChatGPT subscription such as Plus, Pro, Business, or Enterprise, since access on the Free and Go tiers is very limited.

TL;DR - OpenAI Codex

Cloud agent in ChatGPT that takes a coding task and returns a reviewable pull request
Runs each task in an isolated sandbox, so you can run many in parallel
Connects to GitHub, follows AGENTS.md, and shows the test logs behind every change

Pricing: Free plan available

Best for: Growing teams

4.7/5 across review platforms

What is OpenAI Codex?

Editorial review

OpenAI Codex is a cloud-based software engineering agent built into ChatGPT. You delegate coding tasks in plain language and Codex works in its own sandboxed cloud environment: it reads your repository, writes and edits code, runs tests, and proposes a pull request for you to review and merge. Because each task runs in an isolated environment, you can launch many tasks in parallel and check back on the results. It is aimed at developers who want to offload well-scoped work, from fixing bugs and shipping features to refactoring and answering questions about a codebase. Codex connects to GitHub, follows repo-specific setup and guidance (AGENTS.md), and surfaces the logs and test output behind its changes so you can verify exactly what it did. A companion Codex CLI brings the same agent to your terminal for local, interactive work.

LCLouis CorneloupUpdated May 29, 2026 · how we evaluateSourceopenai.com ↗

Pros & Cons

Cons

Meaningful use requires a paid ChatGPT subscription such as Plus, Pro, Business, or Enterprise, since access on the Free and Go tiers is very limited.
The cloud sandbox runs with internet access disabled during task execution by default, so any task that needs to install dependencies or call external APIs requires you to manually configure domain allowlists and permitted HTTP methods per environment.
Codex executes autonomously in isolated containers and hands back a finished pull request, so you cannot steer or correct it mid-task the way you can with interactive assistants like Cursor; you only review the changes after the run completes.
The Codex CLI assumes a Unix-style environment, so Windows users must run it through WSL2 rather than natively, adding setup friction.

Ratings Across the Web

4.7(5 reviews)

OpenAI Codex holds an aggregate rating of 4.7 out of 5 from 5 reviews across G2 and SourceForge, last checked May 29, 2026.

Ratings aggregated from independent review platforms. Learn more

Key Features

Delegate tasks in natural language and get back a pull requestSandboxed cloud environment per task with parallel executionGitHub integration and repo-aware setup via AGENTS.mdRuns tests and surfaces logs so changes are verifiableCompanion Codex CLI for local terminal work