What is DeepSeek?
DeepSeek is a Chinese AI company, founded in July 2023 in Hangzhou and funded by hedge fund High-Flyer, that builds large language models. It became world-famous in January 2025 when its low-cost, open-weight R1 reasoning model matched top Western models. Its 2026 flagship is the DeepSeek-V4 series, released under the MIT License.
Why — the first-principles explanation
At its core, DeepSeek makes large language models — AI systems trained on enormous amounts of text to predict and generate language, which lets them answer questions, write code, and reason through problems. In that sense it does the same job as ChatGPT. What makes DeepSeek notable is how it does it and who made it.
DeepSeek grew out of a Chinese quantitative hedge fund called High-Flyer, which had already bought large clusters of GPUs for trading. Its founder, Liang Wenfeng, spun the AI research into a separate company in 2023. Because the team came from finance and had limited access to the newest chips due to US export controls, they were forced to compete on efficiency rather than raw scale — squeezing more capability out of fewer, older GPUs.
The result reshaped the industry's assumptions. DeepSeek released its models as open weights under the permissive MIT License, meaning anyone can download and run them. When R1 arrived in January 2025 performing near the level of far more expensive models, it triggered a global reaction — including a sharp US tech-stock selloff — because it suggested frontier AI didn't require the massive budgets everyone assumed. That 'do more with less' identity is what DeepSeek fundamentally is.
An example that makes it click
Imagine a small, scrappy kitchen that couldn't afford the giant industrial ovens the famous restaurants used. Instead of giving up, the cooks invented clever techniques to make equally delicious meals with cheaper equipment — and then, shockingly, published their recipes for free.
Suddenly everyone realized you didn't need a billion-dollar kitchen to serve world-class food. That's DeepSeek: a lab that, boxed in by chip limits, engineered its way to top-tier AI on a fraction of the budget and then gave the recipe away. The famous restaurants (and their investors) got very nervous overnight.
Key facts
- DeepSeek (Hangzhou DeepSeek Artificial Intelligence) was founded in July 2023 in Hangzhou, China.
- It is funded and owned by the Chinese quantitative hedge fund High-Flyer; founder and CEO is Liang Wenfeng.
- Its DeepSeek-R1 reasoning model launched January 20, 2025, under the MIT License and matched leading models at far lower cost.
- R1's debut triggered a major US tech-stock selloff in late January 2025 over AI-cost assumptions.
- The 2026 flagship is the DeepSeek-V4 series (V4-Flash and V4-Pro), with a 1 million token context window, under the MIT License.
An open-weight Chinese model family that matched frontier quality at low cost.
Affiliate link — we may earn a commission at no cost to you.▶ The 60-second explainer (script)
What is DeepSeek? It's a Chinese artificial intelligence company that builds large language models — the kind of AI that chats, writes code, and reasons like ChatGPT does. It was founded in 2023 in Hangzhou and is backed by a hedge fund called High-Flyer, led by Liang Wenfeng. DeepSeek became world-famous in January 2025 when it released a model called R1 that matched the best Western models but cost a tiny fraction to build — and it gave the model away for free under an open license. That single release rattled the whole industry and even caused a big drop in US tech stocks, because it proved you didn't need a giant budget to reach the frontier. Its latest 2026 flagship is the DeepSeek-V4 series. In short: DeepSeek is the lab that made powerful AI cheap and open.
What authoritative sources say
People also ask
Is DeepSeek a company or a model?
Both — DeepSeek is the company, and it also names its models DeepSeek (like V3, R1, and the V4 series).
What is DeepSeek used for?
Answering questions, writing and debugging code, math and reasoning tasks, and building AI apps via its API or open weights.
Why did DeepSeek make headlines?
Its R1 model matched top models at a fraction of the cost and was released open-source, prompting a global market reaction in January 2025.
Is DeepSeek open source?
Its model weights are released under the permissive MIT License, so anyone can download, run, and modify them.