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Claude, ChatGPT, and Codex are good at different things. The problem was that each one started with a different memory. So I built AmitOS in Notion. It holds the rules, context, tasks, and files behind my workflow. Each AI can read the same starting point, update the same work, and stop when a decision needs me. The model can change. The context stays. Free field guide: https://www.agenticamit.com/resources/amitos-field-guide/how-i-built-amitos-field-guide.pdf