What Is DeepSeek?
Harry
· 15 Oct 2026
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The Short Story
DeepSeek is a Chinese AI lab whose open-weight models matched frontier performance on reasoning, math and code while costing far less to train and run. Its chat app is free, its API is famously cheap, and researchers can download and run the weights themselves.
Why It Matters
Three shocks: capability near the best closed models, pricing an order of magnitude lower, and openness that lets anyone inspect, fine-tune and self-host. It reset expectations for what AI should cost.
What You Get
A free chat app with a deep-reasoning mode, file uploads, and web search; plus an OpenAI-compatible API and downloadable models for local or private deployment.