logo
episode-header-image
Sep 16
1h 20m

How OpenAI Built Its Coding Agent

Andreessen Horowitz
About this episode

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

In this episode, General Partner Anjney Midha goes behind the scenes with one of Codex’s product leads- Alexander Embiricos - to unpack its origin story, why its PR success rate is so high, the safety challenges of autonomous agents, and what this all means for developers, students, and the future of coding.

 

Timecodes:

0:00 Intro: The Vision for AI Agents

1:25 Codex’s Origin and Naming

3:20 Early Prototypes and Agent Form Factors

6:00 Cloud Agents: Safety and Security

9:40 Prompt Injection and Attack Vectors

12:00 PR Merging: Metrics and Transparency

17:00 The Future of Code Review and Automation

20:00 User Adoption: Internal vs. External Surprises

22:00 Multi-Turn Interactions and Product Learnings

29:30 Best-of-N, Slot Machine Analogy, and Creativity

33:00 Human Taste, Iteration, and Collaboration

40:00 AI’s Impact on Software Engineering Careers

45:00 Education, CS Degrees, and AI Integration

49:00 Prototyping, Hackathons, and Speed to Magic

55:00 Legacy Code, Modernization, and Global Adoption

1:00:00 Enterprise, Security, and Air-Gapped Environments

1:05:00 Product Roadmap and Future of Codex

1:10:00 Advice for Founders and Startups

1:15:00 Education Reform and Project-Based Learning

1:20:00 Hiring, Building, and New Grad Advice

 

Resources: 

Find Alex on X: https://x.com/embirico

Find Anjney on X: https://twitter.com/AnjneyMidha

 

Stay Updated: 

If you enjoyed this episode, be sure to like, subscribe, and share with your friends!

Find a16z on X: https://x.com/a16z

Find a16z on LinkedIn: https://www.linkedin.com/company/a16z

Listen to the a16z Podcast on Spotify: https://open.spotify.com/show/5bC65RDvs3oxnLyqqvkUYX

Listen to the a16z Podcast on Apple Podcasts: https://podcasts.apple.com/us/podcast/a16z-podcast/id842818711

Follow our host: https://x.com/eriktorenberg

Please note that the content here is for informational purposes only; should NOT be taken as legal, business, tax, or investment advice or be used to evaluate any investment or security; and is not directed at any investors or potential investors in any a16z fund. a16z and its affiliates may maintain investments in the companies discussed. For more details please see a16z.com/disclosures.

Stay Updated:

Find a16z on X

Find a16z on LinkedIn

Listen to the a16z Podcast on Spotify

Listen to the a16z Podcast on Apple Podcasts

Follow our host: https://twitter.com/eriktorenberg

 

Please note that the content here is for informational purposes only; should NOT be taken as legal, business, tax, or investment advice or be used to evaluate any investment or security; and is not directed at any investors or potential investors in any a16z fund. a16z and its affiliates may maintain investments in the companies discussed. For more details please see a16z.com/disclosures.


Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.

Up next
Yesterday
Sam Altman on Sora, Energy, and Building an AI Empire
Sam Altman has led OpenAI from its founding as a research nonprofit in 2015 to becoming the most valuable startup in the world ten years later.In this episode, a16z Cofounder Ben Horowitz and General Partner Erik Torenberg sit down with Sam to discuss the core thesis behind OpenA ... Show More
48m 25s
Oct 7
How to Build a Real Estate Marketplace - Kaz Nejatian, Opendoor CEO
Opendoor is trying to make it easier to buy a home. Kaz Nejatian just joined as CEO to help them succeed.In this episode, a16z General Partners Alex Rampell and Erik Torenberg sit down with Kaz to cover all things real estate and marketplaces. They cover Kaz’s vision for Opendoor ... Show More
55m 44s
Oct 6
Can the US Beat China’s Engineering State?
From high-speed rail to electric cars to batteries to AI, it’s clear that China can operate with incredible speed at massive scale. Can the US still compete?We sat down with Dan Wang, a Research Fellow at the Hoover Institution and the author of “Breakneck: China’s Quest to Engin ... Show More
1h 3m
Recommended Episodes
Oct 2024
Insiders React: SpaceX’s Big Win + Kamala Backs Crypto, Dubai’s Tech Rise, Replit AI Changes Coding
What if you could build and deploy a full app in minutes, without writing a single line of code? In this episode, Chris Saad and Ray Dargham, Co-Founder and CEO at Step, discuss the latest tech news shaping the future for founders and investors.  From crypto policy shifts to grou ... Show More
51m 44s
Apr 2025
Next-Gen Founders: Startups in the Age of AI (Edu)
Is AI making startups easier—or just changing the rules of the game?In a world where execution is cheap and accessible, building a successful startup is more competitive than ever. In this episode, Chris Saad and Yaniv Bernstein unpack the reality of every business having access ... Show More
53m 2s
Jun 2024
Are Coding Jobs at Risk? AI's Impact on the Future of Coding ft. Python Simplified | Mariya Sha
Episode 12: Are coding jobs at risk with the rise of AI? Matt Wolfe (https://x.com/mreflow) and Nathan Lands (https://x.com/NathanLands) dive into this compelling topic with guest Mariya Sha (https://x.com/mariyasha888), a seasoned coder and the creator of the popular YouTube cha ... Show More
42m 37s
Feb 2023
Marc Andreessen - AI, Crypto, 1000 Elon Musks, Regrets, Vulnerabilities, & Managerial Revolution
My podcast with the brilliant Marc Andreessen is out!We discuss:* how AI will revolutionize software* whether NFTs are useless, & whether he should be funding flying cars instead* a16z's biggest vulnerabilities* the future of fusion, education, Twitter, venture, managerialism, & ... Show More
1h 19m
Sep 11
$46B of hard truths from Ben Horowitz: Why founders fail and why you need to run toward fear (a16z co-founder)
Ben Horowitz is the co-founder of Andreessen Horowitz, Silicon Valley’s largest and most influential venture capital firm, with over $46B in committed capital across multiple funds. He took Loudcloud public with just $2 million in revenue (dubbed “the IPO from hell”), sold it for ... Show More
1h 37m
Dec 2024
Bolt’s Eric Simons on Enabling Everyone to Generate Websites with AI
In this episode of No Priors, Sarah talks with Eric Simons, co-founder and CEO of StackBlitz. The company has experienced explosive growth since the launch 2 months ago of Bolt.new, an AI application that lets users prompt, run, edit, and deploy full-stack applications directly i ... Show More
38m 17s
Sep 17
TECH001: AI for Activists w/ Justin Moon and Shroominic (Tech Podcast)
From Oslo's spotlight to global frontlines, Justin and Shroominic share how activists are harnessing AI for storytelling, translation, and rapid response while also navigating threats from authoritarian AI. Explore the core building blocks, decentralized models, and how anyone ca ... Show More
49m 43s
Sep 2024
A Lessin In Gen AI with Sam Lessin of Slow Ventures | Okay, Computer.
Dan Nathan and Deirdre Bosa explore Amazon's strategic investment in Anthropic, the potential of Apple's upcoming AI features, and the importance of cloud service credits in AI investments. The regulatory challenges and future of TikTok in the US market are also scrutinized.After ... Show More
1h 4m
Aug 31
How we restructured Airtable’s entire org for AI | Howie Liu (co-founder and CEO)
Howie Liu is the co-founder and CEO of Airtable, the no-code platform valued at around $12 billion. After a viral tweet declared “Airtable is dead” based on incorrect data, Howie led a radical transformation: reorganizing the entire company around AI, becoming an “IC CEO” who cod ... Show More
1h 40m
Mar 2025
Model Development Best Practices for Insurance - with Mark McLaughlin of IBM
Today’s guest is Mark McLaughlin, Director of Insurance in IBM’s Global Industries Unit. Mark joins the podcast to discuss the biggest challenges insurers face today and how AI is transforming workflows, risk management, and customer experience. Later, he and Emerj Managing Edito ... Show More
19m 12s