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OpenAI's New Codex Agent is Ready to Replace Your Dev Team

Ps, the name is recycled

Author

Thomas Smith
May 16, 2025

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OpenAI's New Codex Agent is Ready to Replace Your Dev Team

Today, OpenAI released Codex, its brand new agentic AI designed to replace your dev team—or at least help your senior devs code much faster.

Firstly, let’s acknowledge that the name is a little hilarious, primarily because it’s recycled. OpenAI launched something called Codex back in 2021.

I know, because I tested it back in my days as an OpenAI Beta tester, and even spoke to the NY Times about it.

Now, Codex is back, reborn as an agentic platform that connects to your team’s GIT repository, grabs live code, makes its own contributions, and adds new code/functions into your product.

Here’s my full analysis (watch on Youtube).

A couple of my takeaways from the launch:

  • This is OpenAI’s first real AI agent! Agents move beyond providing information (like ChatGPT) and actually go out into the world (or at least the world of the Internet) to do things for you. It makes sense that OpenAI started with a coding agent. Coding is valuable, and it’s something a lot of companies pay a lot of money for. Automating that work is high impact. Code is also easier to verify than something like a blog post. Either it runs or it doesn’t. That makes it a good use case for an agent—the agent can write code, instantly check its work, and iterate until it gets things right.

  • This is an enterprise grade product. You need a Git repo to use it. If you have no idea what that is, then Codex is not for you.

  • OpenAI is basically giving Codex away for free. Again, code is a good fit for this kind of business model. It’s high impact, but also relatively easy for LLMs to generate. If OpenAI was giving away an agent that created videos for social media, it would cost a fortune. Code doesn’t require nearly as much compute, so it’s easier for them to take a risk on.