Copilot
83% accuracyHallucination risk: Moderateby Microsoft · Last updated June 2026
AI woven into Windows, Office, and Bing.
Overview
Microsoft Copilot brings OpenAI models into Windows, Microsoft 365, and Bing, with web grounding for current questions. It shines on productivity tasks inside documents, spreadsheets, and email, where it has direct context to work with.
Strengths
- Deep integration with Office and Windows
- Web grounding via Bing for current info
- Strong for document and spreadsheet tasks
- Convenient where you already work
Weaknesses
- Inherits the base model's hallucination tendencies
- Answer quality varies across Copilot surfaces
- Citations may be incomplete or imprecise
- Can misinterpret complex spreadsheet logic
How accurate is it?
Copilot's accuracy largely tracks the underlying OpenAI model plus Bing grounding. In productivity contexts where it can read your actual file, it tends to be reliable; on open-ended factual questions it carries the same risks as any chat assistant.
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Hallucination profile
Copilot can fabricate details just like other assistants, and in spreadsheet or data tasks it may produce confident formulas or summaries that are subtly wrong. Verify outputs against the underlying data before acting on them.
Best use cases
- Drafting and editing inside Office
- Summarizing emails and documents
- Spreadsheet formulas and explanations
- Quick web-grounded questions in Windows
Verification tips
- Re-check generated formulas against your data
- Open Bing citations to confirm claims
- Don't trust summaries of files you haven't read
- Compare important answers with another model
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