OpenAI’s GPT-5 turns one tomorrow, and the company is marking the week by looking beyond individual models. Today, OpenAI introduced Agent Plugins, an open standard meant to let reusable AI-agent extensions work across compatible products. GPT-5’s first year GPT-5 launched August 7, 2025, replacing GPT-4o and several reasoning models as ChatGPT’s default. Its defining feature was automatic routing: ChatGPT could answer quickly or invoke deeper reasoning depending on the request. OpenAI also clai...