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OpenAI DevDay Keynote Recap (2025) Massive scale update: Here’s everything new from OpenAI 1. Apps inside ChatGPT OpenAI launched the new Apps SDK, letting developers build full apps that run inside ChatGPT: - Apps SDK lets devs embed full apps inside ChatGPT - Early partners: Canva, Zillow, Coursera, Figma - SDK in beta, store + monetization coming soon 2. AgentKit launched OpenAI’s new suite for building & deploying AI agents: - Agent Builder → a simple drag-and-drop editor (like n8n) to design AI agents - ChatKit → ready-made chat interface so your agent can talk like ChatGPT - Evals → test and improve your agent’s performance - Connectors → let your agent pull live info from apps, websites, or databases. 3. Codex updates: - GPT-5 Codex now generally available - New Slack integration + SDK for developers 4. API & Model updates: - GPT-5 Pro now in API ($15 input / $120 output per 1 M tokens) - GPT-Realtime-Mini: 70% cheaper, optimized for live voice interactions - Sora 2 added to API .