How Codex is built

How Codex is built

I'm actively using the "Codex" agent in my work and it has always intrigued me how it works. I even wanted to find a repository with the source code and read it. Fortunately, today I stumbled upon a link to a post, where this topic is discussed. It explains the architecture and the engineering choices behind Codex.

I would summarize it as:
🤖 Codex is written in Rust
🤖 OpenAI uses Codex to build Codex
🤖 OpenAI developers multitask heavily with Codex
🤖 Skills are worth learning
🤖 Codex runs in a secure sandbox
🤖 Codex is a ReAct agent