Guide explains how OpenAI’s Agents API fits alongside ChatGPT and Codex

The guide says OpenAI introduced the Agents API on September 10, 2026, and that it was in public beta when the guide was shared the next day. It separates using ChatGPT or the Codex app from building OpenAI-powered features into other products, where developers can connect models and agents to their own interfaces, data and tools. It also distinguishes the OpenAI SDK, which helps developers call APIs, from the Agents SDK, which provides an agent framework—not extra apps everyone needs to install.