whereismyai
Codex
Codex is OpenAI's coding agent that writes, reviews and ships code in the cloud, in the terminal, in IDEs and in the Codex app.
Codex is OpenAI's software engineering agent. It works on many tasks in parallel in the cloud, in your terminal through the open-source Codex CLI, in IDE extensions, in the Codex desktop app for macOS and Windows, and from the ChatGPT mobile app. It reads your repository, writes and runs code and tests in a sandbox, and proposes changes as pull requests for you to review. It is included with ChatGPT plans that have Codex access.
Codex at a glance
- Best for: Software engineer
- Runs on: Web, macOS, Windows, iOS, Android, CLI, VS Code
- Pricing: Included with ChatGPT Plus ($20/month), Pro (from $100/month), Business ($25/user/month) and Enterprise plans
- Released: April 2025
- Category: AI coding tool
- Website: chatgpt.com
Key features
- Runs multiple coding tasks in parallel in cloud sandboxes
- Open-source Codex CLI for the terminal
- Desktop app for managing several agents at once
- Proposes changes as pull requests with test results
- Code review and security scanning
- Works from the ChatGPT mobile app
Use it for
- Delegate bug fixes and small features
- Review pull requests before merging
- Refactor or migrate code across a repository
Companions
Tools that articles about Codex recommend using with it, each with its job.
- Context7 — Injects live, version-accurate library docs into Codex.
- Firecrawl — Search, scrape and crawl the web from Codex.
- Composio — One login for GitHub, Linear, Slack and 1,000+ apps.
- Superpowers — Plan, test and execute workflows across harnesses.
- Impeccable — Audits and improves UI design, typography and accessibility.
- RTK — Compresses command output before it reaches the context.
Companion to
Tools whose articles name Codex as a companion, each with its job for them.
Alternatives to Codex
- OpenCode — Works with 75+ model providers, local models, and existing subscriptions
- ChatGPT Learn — It enables automated security scans and vulnerability remediation for code.
- OpenChamber — Run and review multi-model AI coding agents from desktop, browser, and mobile devices.
- Open Computer Use — Provides an open-source alternative to Codex Computer Use with cross-platform support.
- Otto — It keeps agents running on a cloud machine when your laptop sleeps.
- Cline — Open source, any model, with approval on every step
- OpenClaude — Connects one terminal interface to over 200 different AI models.
- Orca — Runs multiple AI coding agents simultaneously in isolated workspaces.
- Kilo Code — Open-source agent with any model and no markup on inference
- Oh My OpenAgent — Executes complex coding and research tasks independently using a keyword.
- Open Agents Template — Spawn autonomous coding agents with full sandboxes and durable workflows.
- Archon — Orchestrate multiple AI agents with isolated workflows via a single command layer.
All Codex alternatives