Hello @Cristina Lively-Myers ! The short version is Copilot is built to be the best assistant inside Microsoft 365, not the best AI overall. Under the hood it runs mostly OpenAI models with a 365 wrapper on top, but with tighter guardrails, smaller context windows, and fewer features than what ChatGPT, Claude, or Gemini push in their own flagship products. On public benchmarks for reasoning, coding, long-document work, and on Chatbot Arena, it consistently trails the frontier models by a real margin. That's the main reason the summit focuses on the three that are actually racing at the edge, Copilot tends to follow their releases 6-12 months later. Between Copilot and Gemini for running a whole business, Gemini wins on most practical fronts. 1M+ token context (vs Copilot's ~64k in most flows) means you can drop an entire inventory sheet, full P&L, or a year of marketing briefs in and have it actually reason over all of it. It also has Gems (custom agents you build once and reuse), native Workspace integration if you touch Docs/Sheets/Gmail, NotebookLM for research across large document sets, and built-in image and video generation (Imagen and Veo). Copilot's real edge is only if you genuinely live inside Word, Excel, Outlook, and Teams all day, and even there the Excel side is the strongest piece while the rest feels like a shallower layer over the same models everyone else has direct access to. If you want one system to cover marketing, inventory, and accounting end-to-end, most people end up on ChatGPT (Projects + Custom GPTs handle a huge range), or Gemini (long context + Workspace pull), with Claude as the sharpest option for writing, reasoning, and anything document-heavy. Copilot is usually the "we already pay for 365" choice, not the "this is the best tool for the job" one. Hope that helps =)