LIVESTREAM: OpenAI Dev Day Stream

Quick Overview

OpenAI Dev Day 2025 announced the Apps SDK for building interactive applications inside ChatGPT, the Agent Kit suite for simplifying agent development, and the graduation of Codeex to General Availability (GA) with new enterprise features, all aimed at making it easier and faster for developers to build with AI.

Key Points: OpenAI launched the Apps SDK, enabling developers to build full-stack, interactive applications within ChatGPT, accessible to hundreds of millions of users, with monetization plans including the Agentic Commerce Protocol. The Apps SDK supports connecting data, triggering actions, and rendering interactive UI via MCP standards, demonstrated with live integrations for Corsera (explaining video content), Canva (generating assets), and Zillow (filtering real estate data). OpenAI introduced Agent Kit, a set of open platform building blocks including Agent Builder (a visual canvas), ChatKit (embeddable chat interface), and Evals dedicated to measuring agent performance, designed to move agents from prototype to production faster. Agent Kit was demonstrated by building and deploying the 'Ask Froge' agent on the DevDay website in under eight minutes, showcasing visual workflow design, tool integration, guardrails, and widget customization. Codeex, OpenAI's software engineering agent, graduated from research preview to General Availability (GA) and now runs on the new GPT-5 Codeex model, leading to a 10x increase in daily messages since early August. New Codeex features for engineering teams include a Slack integration, a Codeex SDK for workflow automation, and admin tools for enterprises; Cisco reported using Codeex to get through code reviews 50% faster. OpenAI reported significant growth: 4 million weekly developers and over 800 million weekly ChatGPT users, processing over 6 billion tokens per minute on the API, up from 300 million tokens per minute at DevDay 2023.

Context: The livestream served as a pre-show for OpenAI's Dev Day 2025, featuring a host discussing technical delays, community engagement, and expectations for major announcements, including speculation around AMD partnerships and the capabilities of Sora 2 and potential GPT-5 features. The main focus shifted once the official stream began, pivoting to concrete product announcements aimed squarely at improving the developer experience across applications, agents, and coding assistance.