Codex clearly explained (and how to use it)

Codex clearly explained (and how to use it)

From The Startup Ideas Podcast by Greg Isenberg

April 27, 2026 · 1h 26m

About this episode

Greg Isenberg interviews Riley Brown about OpenAI's Codex and its potential as a super app for various tasks.

I sit down with Riley Brown to get a hands-on tour of OpenAI's Codex, which he argues is the most powerful single interface for using AI agents today. Riley walks me through how Codex unifies vibe coding, knowledge work, browser use, computer use, and automations into one app, all running on GPT 5.5. I come in as a complete Codex skeptic who has spent most of my time in Claude Code, and Riley shows me skills, plugins, projects, Remotion, Chronicle, and the in-app browser to make his case. By the end, the question becomes whether the era of separate tools for documents, decks, code, and research is collapsing into a single super app. 00:00 – Intro 03:23 – What is Codex 06:46 – Why a GUI beats the terminal for most users 10:13 – Codex: the all in one platform 12:48 – Atlas browser inside Codex 14:21 – Remotion explained and motion graphics workflows 19:28 – Computer use and Chronicle 22:26 – Plugins, skills, MCPs, and integrations 31:57 – Evals, examples, and good outpu 38:43 – Hard questions: who Codex is built for 40:44 – Browser use plays itself in chess 43:20 – Running Claude Code inside Codex 45:58 – GPT 5.5 cost and effort settings 48:50 – GPT Images 2.0 54:09 – Why most…

People in this episode

Host: Greg Isenberg

Guest: Riley Brown

Topics covered

  • AI tools
  • Codex
  • super app
  • automation
  • coding
  • knowledge work
  • browser use

Keywords

  • Codex
  • AI agents
  • GPT 5.5
  • automation
  • Remotion
  • Chronicle
  • plugins
  • skills

Mentioned in this episode

Products: OpenAI's Codex, GPT 5.5, Claude Code, Remotion, Chronicle, GPT Images 2.0

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