Why humans are AI’s biggest bottleneck (and what’s coming in 2026) | Alexander Embiricos (OpenAI Codex Product Lead)

DEC 14, 202585 MIN
Lenny's Podcast: Product | Career | Growth

Why humans are AI’s biggest bottleneck (and what’s coming in 2026) | Alexander Embiricos (OpenAI Codex Product Lead)

DEC 14, 202585 MIN

Description

<p><strong>Alexander Embiricos</strong> leads product on Codex, OpenAI’s powerful coding agent, which has grown 20x since August and now serves trillions of tokens weekly. Before joining OpenAI, Alexander spent five years building a pair programming product for engineers. He now works at the frontier of AI-led software development, building what he describes as a software engineering teammate—an AI agent designed to participate across the entire development lifecycle.</p><p></p><p><strong>We discuss:</strong></p><p>1. Why Codex has grown 20x since launch and what product decisions unlocked this growth</p><p>2. How OpenAI built the Sora Android app in just 18 days using Codex</p><p>3. Why the real bottleneck to AGI-level productivity isn’t model capability—it’s human typing speed</p><p>4. The vision of AI as a proactive teammate, not just a tool you prompt</p><p>5. The bottleneck shifting from building to reviewing AI-generated work</p><p>6. Why coding will be a core competency for every AI agent—because writing code is how agents use computers best</p><p>—</p><p><strong>Brought to you by:</strong></p><p><a target="_blank" href="https://workos.com/lenny"><strong>WorkOS</strong></a>—Modern identity platform for B2B SaaS, free up to 1 million MAUs: <a target="_blank" href="https://workos.com/lenny">https://workos.com/lenny</a></p><p><a target="_blank" href="https://fin.ai/lenny"><strong>Fin</strong></a>—The #1 AI agent for customer service: <a target="_blank" href="https://fin.ai/lenny">https://fin.ai/lenny</a></p><p><a target="_blank" href="https://atlassian.com/lenny/?utm_source=lennypodcast&#38;utm_medium=paid-audio&#38;utm_campaign=fy24q1-jpd-imc"><strong>Jira Product Discovery</strong></a>—Confidence to build the right thing: <a target="_blank" href="https://atlassian.com/lenny/?utm_source=lennypodcast&#38;utm_medium=paid-audio&#38;utm_campaign=fy24q1-jpd-imc">https://atlassian.com/lenny/?utm_source=lennypodcast&utm_medium=paid-audio&utm_campaign=fy24q1-jpd-imc</a></p><p>—</p><p><strong>Transcript: </strong><a target="_blank" href="https://www.lennysnewsletter.com/p/why-humans-are-ais-biggest-bottleneck">https://www.lennysnewsletter.com/p/why-humans-are-ais-biggest-bottleneck</a></p><p>—</p><p><strong>My biggest takeaways (for paid newsletter subscribers): </strong><a target="_blank" href="https://www.lennysnewsletter.com/i/180365355/my-biggest-takeaways-from-this-conversation">https://www.lennysnewsletter.com/i/180365355/my-biggest-takeaways-from-this-conversation</a></p><p>—</p><p><strong>Where to find Alexander Embiricos:</strong></p><p>• X: <a target="_blank" href="https://x.com/embirico">https://x.com/embirico</a></p><p>• LinkedIn: <a target="_blank" href="https://www.linkedin.com/in/embirico">https://www.linkedin.com/in/embirico</a></p><p>—</p><p><strong>Where to find Lenny:</strong></p><p>• Newsletter: <a target="_blank" href="https://www.lennysnewsletter.com">https://www.lennysnewsletter.com</a></p><p>• X: <a target="_blank" href="https://twitter.com/lennysan">https://twitter.com/lennysan</a></p><p>• LinkedIn: <a target="_blank" href="https://www.linkedin.com/in/lennyrachitsky/">https://www.linkedin.com/in/lennyrachitsky/</a></p><p>—</p><p><strong>In this episode, we cover:</strong></p><p>(00:00) Introduction to Alexander Embiricos </p><p>(05:13) The speed and ambition at OpenAI</p><p>(11:34) Codex: OpenAI’s coding agent</p><p>(15:43) Codex’s explosive growth</p><p>(24:59) The future of AI and coding agents</p><p>(33:11) The impact of AI on engineering</p><p>(44:08) How Codex has impacted the way PMs operate</p><p>(45:40) Throwaway code and ubiquitous coding</p><p>(47:10) Shipping the Sora Android app</p><p>(49:01) Building the Atlas browser</p><p>(53:34) Codex’s impact on productivity</p><p>(55:35) Measuring progress on Codex</p><p>(58:09) Why they are building a web browser</p><p>(01:01:58) Non-engineering use cases for Codex</p><p>(01:02:53) Codex’s capabilities</p><p>(01:04:49) Tips for getting started with Codex</p><p>(01:05:37) Skills to lean into in the AI age</p><p>(01:10:36) How far are we from a human version of AI?</p><p>(01:13:31) Hiring and team growth at Codex</p><p>(01:15:47) Lightning round and final thoughts</p><p>—</p><p><strong>Referenced:</strong></p><p>• OpenAI: <a target="_blank" href="https://openai.com">https://openai.com</a></p><p>• Codex: <a target="_blank" href="https://openai.com/codex">https://openai.com/codex</a></p><p>• Inside ChatGPT: The fastest-growing product in history | Nick Turley (Head of ChatGPT at OpenAI): <a target="_blank" href="https://www.lennysnewsletter.com/p/inside-chatgpt-nick-turley">https://www.lennysnewsletter.com/p/inside-chatgpt-nick-turley</a></p><p>• Dropbox: <a target="_blank" href="http://dropbox.com">http://dropbox.com</a></p><p>• Datadog: <a target="_blank" href="https://www.datadoghq.com">https://www.datadoghq.com</a></p><p>• Andrej Karpathy on X: <a target="_blank" href="https://x.com/karpathy">https://x.com/karpathy</a></p><p>• The rise of Cursor: The $300M ARR AI tool that engineers can’t stop using | Michael Truell (co-founder and CEO): <a target="_blank" href="https://www.lennysnewsletter.com/p/the-rise-of-cursor-michael-truell">https://www.lennysnewsletter.com/p/the-rise-of-cursor-michael-truell</a></p><p>• Atlas: <a target="_blank" href="https://openai.com/index/introducing-chatgpt-atlas">https://openai.com/index/introducing-chatgpt-atlas</a></p><p>• How Block is becoming the most AI-native enterprise in the world | Dhanji R. Prasanna: <a target="_blank" href="https://www.lennysnewsletter.com/p/how-block-is-becoming-the-most-ai-native">https://www.lennysnewsletter.com/p/how-block-is-becoming-the-most-ai-native</a></p><p>• Goose: <a target="_blank" href="https://block.xyz/inside/block-open-source-introduces-codename-goose">https://block.xyz/inside/block-open-source-introduces-codename-goose</a></p><p>• Lessons on building product sense, navigating AI, optimizing the first mile, and making it through the messy middle | Scott Belsky (Adobe, Behance): <a target="_blank" href="https://www.lennysnewsletter.com/p/lessons-on-building-product-sense">https://www.lennysnewsletter.com/p/lessons-on-building-product-sense</a></p><p>• Sora Android app: <a target="_blank" href="https://play.google.com/store/apps/details?id=com.openai.sora&#38;hl=en_US&#38;pli=1">https://play.google.com/store/apps/details?id=com.openai.sora&hl=en_US&pli=1</a></p><p>• The OpenAI Podcast—ChatGPT Atlas and the next era of web browsing: <a target="_blank" href="https://www.youtube.com/watch?v=WdbgNC80PMw&#38;list=PLOXw6I10VTv9GAOCZjUAAkSVyW2cDXs4u&#38;index=2">https://www.youtube.com/watch?v=WdbgNC80PMw&list=PLOXw6I10VTv9GAOCZjUAAkSVyW2cDXs4u&index=2</a></p><p>• How to measure AI developer productivity in 2025 | Nicole Forsgren: <a target="_blank" href="https://www.lennysnewsletter.com/p/how-to-measure-ai-developer-productivity">https://www.lennysnewsletter.com/p/how-to-measure-ai-developer-productivity</a></p><p>• Compiling: <a target="_blank" href="https://3d.xkcd.com/303">https://3d.xkcd.com/303</a></p><p>• <em>Jujutsu Kaisen</em> on Netflix: <a target="_blank" href="https://www.netflix.com/title/81278456">https://www.netflix.com/title/81278456</a></p><p>• Tesla: <a target="_blank" href="https://www.tesla.com">https://www.tesla.com</a></p><p>• Radical Candor: From theory to practice with author Kim Scott: <a target="_blank" href="https://www.lennysnewsletter.com/p/radical-candor-from-theory-to-practice">https://www.lennysnewsletter.com/p/radical-candor-from-theory-to-practice</a></p><p>• Andreas Embirikos: <a target="_blank" href="https://en.wikipedia.org/wiki/Andreas_Embirikos">https://en.wikipedia.org/wiki/Andreas_Embirikos</a></p><p>• George Embiricos: <a target="_blank" href="https://en.wikipedia.org/wiki/George_Embiricos">https://en.wikipedia.org/wiki/George_Embiricos</a>: <a target="_blank" href="https://en.wikipedia.org/wiki/George_Embiricos">https://en.wikipedia.org/wiki/George_Embiricos</a></p><p>—</p><p><strong>Recommended books:</strong></p><p>• <em>Culture </em>series: <a target="_blank" href="https://www.amazon.com/dp/B07WLZZ9WV">https://www.amazon.com/dp/B07WLZZ9WV</a></p><p>• <em>The Lord of the Rings</em>: <a target="_blank" href="https://www.amazon.com/Lord-Rings-J-R-R-Tolkien/dp/0544003411">https://www.amazon.com/Lord-Rings-J-R-R-Tolkien/dp/0544003411</a></p><p>• <em>A Fire Upon the Deep </em>(<em>Zones of Thought</em> series Book 1): <a target="_blank" href="https://www.amazon.com/Fire-Upon-Deep-Zones-Thought/dp/1250237750">https://www.amazon.com/Fire-Upon-Deep-Zones-Thought/dp/1250237750</a></p><p>• <em>Radical Candor: Be a Kick-Ass Boss Without Losing Your Humanity</em>: <a target="_blank" href="https://www.amazon.com/Radical-Candor-Kick-Ass-Without-Humanity/dp/1250103509">https://www.amazon.com/Radical-Candor-Kick-Ass-Without-Humanity/dp/1250103509</a></p><p>—</p><p>Production and marketing by <a target="_blank" href="https://penname.co/">https://penname.co/</a>. For inquiries about sponsoring the podcast, email <a target="_blank" href="mailto:[email protected]">[email protected]</a>.</p><p>—</p><p><em>Lenny may be an investor in the companies discussed.</em></p> <br/><br/>To hear more, visit <a href="https://www.lennysnewsletter.com?utm_medium=podcast&#38;utm_campaign=show-notes-no-free-preview-language">www.lennysnewsletter.com</a>