OpenAI’s Model Spec, first released in May 2024, sets out a three-tier framework for guiding how AI assistants like ChatGPT should behave.Published in May 2024, the Spec introduced a three-layer hierarchy: Objectives, Rules, and Defaults .

1. What is Agent File (.af)? The Agent File (.af)  is a new file format designed to store, share, and reproduce AI agents  — especially...