OpenAI Dev Day 2025: Key Updates
OpenAI Dev Day 2025 brings ChatGPT Apps SDK, AgentKit for AI workflows, Codex 2.0 GA, GPT-5 Pro API, and Sora 2. Comprehensive analysis of what these updates mean for developers and enterprises.
OpenAI Dev Day 2025 introduced five platform updates: the ChatGPT Apps SDK, AgentKit, Codex 2.0, the GPT-5 Pro API, and Sora 2. Codex 2.0 and the GPT-5 Pro API are globally available, while the ChatGPT Apps SDK and AgentKit launch first outside the EU, with an EU rollout tied to GDPR compliance reviews. GPT-5 Pro costs about 12 times GPT-4 Turbo and targets high-stakes applications that need stronger reasoning. The Apps SDK lets developers build native ChatGPT applications that read platform context, memory, and user preferences. AgentKit supplies tools for autonomous AI agents that run multi-step workflows. OpenAI sets 2026 as the global availability timeline.
Major Announcements Overview
ChatGPT Apps Platform
New SDK enables developers to build native ChatGPT applications with deep platform integration. Apps can access ChatGPT context, memory, and user preferences.
Deep ChatGPT platform access. Context-aware applications. Users never leave the chat.
Comprehensive SDK. Testing frameworks. Deployment pipelines.
AgentKit for AI Workflows
AgentKit provides tools for building autonomous AI agents that can execute complex multi-step workflows. Designed for enterprise automation and integration.
Codex 2.0 General Availability
Codex 2.0 brings improved code generation, better understanding of programming languages, and enhanced debugging capabilities. Now globally available.
GPT-5 Pro API
GPT-5 Pro offers significantly improved reasoning for high-stakes applications. Costs approximately 12x GPT-4 Turbo but delivers superior performance for complex tasks.
FAQ
Further Information
Let's collaborate
One contact, a team behind it
Thirty minutes on what you're working on, whether grid, metering, market processes, IT architecture or AI. Afterwards you'll know how we'd approach it and who would sit at the table.
Energy and measurement technology since 2010 · innobu GmbH since 2014 · Based in Schleswig-Holstein, Germany
Whoever pitches also delivers: whoever leads the first call stays your contact right through to the steering committee, with established partners in the project. Direct: info@innobu.com