Microsoft Copilot vs DeepSeek

Microsoft Copilot is the umbrella name for Microsoft's AI assistants. The free Copilot app runs on Windows, Edge, iOS, Android and the web with chat, image generation and web-grounded answers, while Microsoft 365 Copilot is the paid business add-on that works inside Word, Excel, PowerPoint, Outlook and Teams and is grounded in an organization's emails, files, chats and meetings through Microsoft Graph.

In business tenants it drafts and rewrites documents, analyzes spreadsheets in natural language, builds presentations from existing files, summarizes long email threads and produces Teams meeting recaps with action items, all within existing permissions and enterprise data protection. Copilot Studio lets organizations build custom agents connected to internal systems and data. Packaging is layered: the free consumer Copilot, Copilot inside Microsoft 365 Personal, Family and Premium subscriptions, free Copilot Chat for business users, and the per-user Microsoft 365 Copilot license.

For companies standardized on Microsoft 365 it is the most natural enterprise assistant, but the add-on is expensive, results depend on clean permissions and well-organized SharePoint content, and quality varies between apps. Google Workspace teams will get more from Gemini, and individuals who mainly want a strong general assistant often prefer ChatGPT or Claude. Most organizations run a pilot group, measure real usage and then license only the roles that benefit most.

DeepSeek is a Chinese AI lab and assistant from Hangzhou, founded in 2023 by Liang Wenfeng and funded by the quantitative hedge fund High-Flyer. It became globally known in January 2025 when its open-weight R1 reasoning model matched leading US models at a fraction of the training cost and pushed the DeepSeek app to the top of app store charts.

There are two products. The chat app on web, iOS and Android is free, with thinking and instant modes, web search and file reading. The API is pay-as-you-go: you top up a balance and pay per million tokens, with cache hits billed far below cache misses and off-peak hours at half price. It accepts both OpenAI and Anthropic request formats, so tools like Claude Code can point at it directly. Model weights are published on Hugging Face, so you can also self-host or use cloud providers.

DeepSeek fits developers and cost-sensitive teams that need strong reasoning and coding at very low token prices. Its weak points are data residency and policy: the hosted service stores data in China, and several governments (Italy, South Korea, Australia, Taiwan) have restricted it. ChatGPT and Claude offer richer apps and enterprise controls, while Mistral Le Chat is the EU-hosted option.

The V4 preview in April 2026 brought 1M-token context, and V4.1-Flash-1017 now serves the flash API. For sensitive data, run the open weights on your own infrastructure instead of the hosted app.