ChatGPT and Microsoft Copilot share the same underlying GPT engine, but they're designed for fundamentally different workflows. ChatGPT is a standalone conversational AI where you bring your own context and iterate freely. Copilot is embedded across Microsoft 365 — it reads your emails, summarizes your meetings, and drafts documents grounded in your organizational data.
Because they serve different purposes, they respond best to different prompting strategies. ChatGPT thrives with detailed, structured system instructions. Copilot thrives with natural language requests that reference your Microsoft 365 data. This guide covers the practical differences.