Alexander Embiricos, product lead for OpenAI's Codex, shares the vision of AI as a software engineering teammate, not just a tool. He explains how a strategic shift to a local, interactive experience unlocked 20x growth, details how the Sora Android app was built in 28 days, and argues that the real bottleneck to AGI-level productivity is now human review speed, not model capability.
OpenAI's Developer State of the Union details the company's journey and unveils significant updates, including the powerful GPT-5 model, the new Codex SDK for agentic coding, the comprehensive Agent Kit for building complex agents, and the Apps SDK for integrating interactive applications directly into ChatGPT.
Developers from OpenAI showcase "Storyboard", a custom tool built in 48 hours that transforms creative workflows. They detail how, in partnership with a film production, they used AI-assisted coding to rapidly prototype a tool that takes artists from initial sketch to high-fidelity images and even full-motion video, drastically reducing production timelines.
Sam Altman's DevDay 2025 keynote introduces major platform updates, including the Apps SDK for building inside ChatGPT, AgentKit for streamlined agent creation, the general availability of the powerful Codex coding agent, and new API access to GPT-5 Pro and Sora 2.
OpenAI's Greg Brockman and Thibault Sottiaux explore the evolution of AI-powered software development, from the first coding sparks in GPT-3 to today's GPT-5 Codex. They detail the concept of the "harness," the rise of agentic coding, breakthroughs in automated code review, and how AI agents capable of running for hours on complex refactoring will reshape the future of engineering.
A hands-on walkthrough of Codex, now a single, unified agent across your IDE, CLI, and GitHub. This summary covers new features like the IDE extension, automated code review, and best practices for delegating tasks to the local and cloud agent for a more efficient development workflow.