Overview
Microsoft Copilot is the company's flagship AI assistant, launched in early 2023 as Bing Chat and rebranded to its current name in November of that year. It is built on Microsoft's proprietary Prometheus architecture, which orchestrates OpenAI's GPT-4o, GPT-4.1, and GPT-5 models alongside Microsoft's own search index. As of mid-2026, enterprise tiers also offer access to Anthropic Claude Opus 4.8 and the internally developed Prometheus model, making it a genuine multi-model platform rather than a simple OpenAI wrapper.
The product exists in two distinct forms. The consumer-facing assistant at copilot.microsoft.com is free, web-grounded, and requires no Microsoft account for basic use. The enterprise offering—marketed as Microsoft 365 Copilot—is an add-on to existing M365 business licenses and connects to a user's real work data: emails, OneDrive and SharePoint files, Teams messages, calendar, and meeting recordings.
Notable 2026 additions include computer use (generally available May 2026), which lets Copilot agents automate browser and desktop application workflows autonomously, and enhanced meeting recaps in Teams that combine written summaries with short video clips.
The core weakness is economic: reaching the product's headline capabilities requires stacking a base M365 license with the Copilot add-on, pushing all-in per-seat costs to $54–$75/month for enterprise users. Organizations already deeply embedded in the Microsoft ecosystem will find genuine value; organizations evaluating AI tooling fresh may find the cost and complexity hard to justify.
Microsoft is headquartered in Redmond, Washington.
Key Benefits
- 365 Ecosystem Integration: Paid tiers connect Copilot directly to a user's live work data—emails, files, meetings—without manual uploading or copy-paste workflows.
- Transparent Source Citations: Every web-grounded response surfaces clickable links to source pages, reducing the verification burden compared to assistants that summarize without attribution.
- Agentic Automation: Computer use and Copilot Studio enable end-to-end task automation across desktop and web applications, moving beyond chat into genuine workflow execution.
- Enterprise Security Baseline: Microsoft 365 Copilot inherits the compliance and data residency commitments of the underlying M365 tenant, which matters for regulated industries.
Use Cases
- Meeting intelligence — Teams integration automatically summarizes meetings, generates action items, and (as of 2026) produces short video recaps, reducing post-meeting note-taking overhead.
- Document drafting in Office apps — Copilot in Word and PowerPoint generates first drafts from prompts or existing files; Copilot in Excel explains formulas and drafts data analyses in plain language.
- Enterprise knowledge search — Work-grounded responses let employees query across email threads, SharePoint sites, and chat history in natural language rather than navigating multiple applications.
- Desktop workflow automation — Computer use agents handle repetitive multi-step tasks across browser and native desktop apps, executing them on behalf of the user without manual intervention.
