Build Hour: API & Codex

By OpenAI

Categories: AI, Product

Summary

OpenAI's latest Codex update enables a new era of 'agent delegation' - using AI assistants to manage increasingly complex dev workflows, with GPT-5.4 supporting up to 1M tokens and progressive tool exposure.

Key Takeaways

  1. Codex desktop app now replaces IDEs for many developers, empowering them to do more, faster.
  2. Skills in the Codex app provide pre-built context and expertise to supercharge agent workflows.
  3. GPT-5.4's 'tool search' feature helps manage hundreds of tools by intelligently exposing only what's needed.
  4. Codex's Windows-native sandboxing brings its security model and coding capabilities to Windows developers.
  5. Connecting ChatGPT and Codex via 'apps' (previously connectors) integrates AI into daily dev workflows.
  6. GPT-5.4's 1M token context and 'computer use agent' capabilities expand the scope of tasks AI can handle.

Topics

Transcript Excerpt

Hey everyone, welcome back to OpenAI Build Hours. I'm Christine. I'm on the startup marketing team and today I'm joined with Charlie and Ryan. >> Hey folks, how's it going? >> Hey everybody. >> Awesome. Um, so Charlie is on our Dev X team and he will be leading the session and Ryan actually came all the way from Seattle to be with us live in the studio today. Um, and he's going to be chatting about the future of work. Um so today's session is all about um API and codecs. And if this is your firs...