OpenAI Dev Day 2025: Key Updates

Apps, AgentKit, Codex 2.0 & GPT-5 Pro

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.

Major Announcements Overview

5
Major platform updates
12x
GPT-5 Pro cost vs GPT-4 Turbo
2026
Global availability timeline

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.

Native Integration

Deep ChatGPT platform access. Context-aware applications. Seamless user experience.

Developer Tools

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

12x
Cost multiplier vs GPT-4 Turbo
Advanced
Reasoning capabilities

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

When are OpenAI Dev Day 2025 updates available? +
Codex 2.0 GA and GPT-5 Pro API are globally available. ChatGPT Apps SDK and AgentKit are initially available outside EU, with EU rollout following GDPR compliance reviews.
What does GPT-5 Pro API cost? +
GPT-5 Pro costs approximately 12x GPT-4 Turbo but offers significantly improved reasoning capabilities for high-stakes applications.

Further Information

OpenAI Dev Day OpenAI Platform