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The a16z Show

How OpenAI Built Its Coding Agent

The a16z Show

a16z

Science, Innovation, Business, Entrepreneurship, Culture, Disruption, Software Eating The World, Technology

4.41.1K Ratings

🗓️ 16 September 2025

⏱️ 80 minutes

🧾️ Download transcript

Summary

OpenAI’s Codex has already shipped hundreds of thousands of pull requests in its first months. But what is it really, and how will coding agents change the future of software?

Transcript

Click on a timestamp to play from that location

0:00.0

It kind of sucks to go and write this prompt and then wait 10 minutes.

0:03.9

What you really want when you hire someone is to kind of tell them what the job is,

0:07.3

give them the credentials, all the tools, and just have them pick up work automatically.

0:10.5

The goal is to get to an agent that is basically a teammate and it's seeing what's going on

0:14.1

on your team and picking stuff up for you.

0:15.7

This form factor of an agent working on its own computer in the cloud is the future

0:19.7

and is incredibly powerful

0:21.3

and worth figuring out how to get right. What happens when AI stops helping you auto-complete

0:27.3

code and starts acting like a real teammate? Today, we're exploring Codex, OpenAI's coding agent.

0:34.1

Anjaday Midha is joined in studio by Alexander and Birak hosts, who leads product for codecs

0:39.0

at OpenAI.

0:40.3

They discuss the origin story, why reasoning models plus tools unlock agents, how developers

0:45.7

are actually using codecs in the wild, and what all this means for the future of software

0:49.9

engineering, from debugging and prototyping to how CS students should think about their careers.

0:55.3

Let's get into it.

1:01.1

Hey, Alex.

1:02.5

Hey, how's going?

1:03.5

Good. Thanks for coming.

1:04.7

Yeah, good see you again.

1:05.8

You are one of the folks working on product for Codex, which is probably one of the most exciting launches

1:12.1

to come out of the Open AI team,

1:13.8

for me, at least in a while.

...

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