Open AI Codex

Open AI Codex

VSCode Extension Codex IDE extension

Features

• Agentic Coding Assistant: Codex can read, edit, and run code directly in your IDE—acting as a hands-on collaborator with approval-based access modes.
• Context-Aware Chat Panel: Seamlessly chats with you using context from open files and selections, enabling shorter prompts and smarter responses.
• Cloud Delegation for Heavy Tasks: Offload complex jobs to Codex in the cloud, with full context retention and previewable results synced back to your IDE.
• Approval Modes for Safety: Choose between Chat, Agent, or Agent (Full Access) to control how Codex interacts with your system and network.
• Built on Codex CLI: The extension is powered by an open-source CLI, allowing advanced configuration, MCP integration, and community-driven extensibility.

Summary

The Codex IDE extension by OpenAI transforms your development environment into a collaborative space where AI actively participates in coding tasks. Designed for Visual Studio Code and its forks (like Cursor and Windsurf), Codex integrates as a sidebar panel, offering real-time chat, code editing, and execution capabilities. What makes Codex stand out is its agentic design—meaning it doesn’t just suggest code, it can read files, make edits, and run commands within your working directory. You control its access level through approval modes: from simple chat to full agent autonomy.

Codex is deeply context-aware. It uses the files you’ve opened and the code you’ve selected to generate precise, relevant responses with minimal prompting. Whether you’re debugging, refactoring, or exploring unfamiliar codebases, Codex acts like a pair programmer that’s always ready to assist. For heavier tasks, you can delegate work to Codex in the cloud. It remembers your local conversation context, executes tasks remotely, and syncs results back into your IDE—allowing you to preview, apply, or follow up without breaking flow.

Security and control are built in. Codex requires explicit approval to access files outside your working directory or use the network, and you can toggle modes depending on your comfort level. The extension is powered by the open-source Codex CLI, which supports advanced configurations and integrations like MCP. While currently supported on macOS and Linux, Windows support is on the horizon. Ultimately, Codex IDE isn’t just an assistant—it’s a coding partner that adapts to your workflow, scales with your tasks, and helps you build faster, smarter, and with greater confidence.

2026.09.08

Status: active — and central to OpenAI’s coding story. Very much alive and actively developed; Codex is now OpenAI’s flagship coding agent (“your new software engineering teammate”).

• Now framed as “a single agent that runs everywhere you code” — terminal (CLI), IDE extension, cloud (Codex web), GitHub, and even your phone — with work moving between local and cloud sandbox without losing state.
• Default model is now GPT-5 (you pick the reasoning level); older models still available via API key. Sign-in via ChatGPT (included in Plus, Pro, Business, Edu, Enterprise plans).
• Works in VS Code + forks (Cursor, Windsurf) plus dedicated Xcode and JetBrains integrations; the extension has ~10M downloads.
• Still the approval-gated model (local quick edits vs. delegate-to-cloud for longer tasks), built on the open-source Codex CLI with MCP support.