What Is DeepSeek? The Open AI Model Shaking Up the Industry

DeepSeek is a Chinese AI company whose open, surprisingly cheap-to-build language models caught the entire industry off guard. Its standout release, the DeepSeek R1 reasoning model, showed that a relatively small lab could match the kind of step-by-step reasoning people expected only from the biggest, best-funded labs — and it did so at a fraction of the usual cost, while making the model freely available. That combination is why DeepSeek became one of the most talked-about names in AI. If large language models are new to you, our explainer on how AI chatbots work covers the basics first.

Where DeepSeek comes from

DeepSeek is an AI lab based in China, spun out of a quantitative trading firm and focused on building frontier large language models. Unlike closed assistants such as ChatGPT and Claude — where the model itself stays locked inside the company — DeepSeek released much of its work openly, letting anyone download, run and build on the models. That open approach, paired with strong performance, is central to why it spread so quickly.

Why DeepSeek caused such a stir

A few things landed at once and made DeepSeek headline news:

• Reasoning at a low cost. DeepSeek reported training its models for far less money than the figures associated with leading US labs. Whether the comparison is perfectly apples-to-apples is debated, but the headline — competitive results without a colossal budget — rattled assumptions about what frontier AI must cost.
• It’s open. Because the models are freely available, developers and companies can run them on their own hardware instead of paying per use to a closed provider. That’s a big deal for cost and control.
• A reasoning model anyone could get. DeepSeek R1 “thinks out loud,” working through problems step by step the way premium reasoning models do — but in an openly available package.

The upshot: DeepSeek made high-end AI look cheaper and more accessible than many had assumed, and that reset expectations across the industry.

What is DeepSeek R1?

DeepSeek R1 is the company’s reasoning-focused model. Rather than answering instantly, a reasoning model spends extra effort breaking a problem into steps before giving its final answer — which tends to help on math, logic and coding. R1 drew attention because it brought that capability into the open, where it had mostly been the preserve of closed, paid models. As with any model, expect the specific versions to change quickly; treat performance claims as a snapshot of around 2026.

DeepSeek vs ChatGPT and Claude

DeepSeek does broadly the same things as other assistants — chatting, writing, coding and reasoning — but the trade-offs are different:

• DeepSeek stands out for being open and low-cost, which appeals to developers who want to self-host or avoid per-use fees.
• ChatGPT (OpenAI) offers the largest ecosystem and the broadest set of features — see what ChatGPT is.
• Claude (Anthropic) is favored for long-form writing, coding and careful reasoning — see what Claude is.

For most casual users, the polished apps from OpenAI and Anthropic are still the easiest on-ramp. DeepSeek’s appeal is strongest for builders who value openness and cost. For a closer look at the closed assistants, see our ChatGPT vs Claude vs Grok comparison.

Is DeepSeek safe to use?

Two separate questions hide inside this one. First, like every chatbot, DeepSeek can hallucinate — produce confident answers that are simply wrong — so verify anything that matters. Second, because DeepSeek is a Chinese service, some users and organizations have raised data-privacy and content concerns about using the hosted app, and several governments and companies have restricted it on official devices. If privacy is a worry, note that the open models can also be run locally, which keeps your data off the company’s servers. As always, don’t put sensitive information into any AI chatbot you don’t control.

The bigger picture

DeepSeek’s real legacy may be less about one model and more about what it signalled: that capable AI can be built more cheaply and shared more openly than the biggest labs implied. That puts pressure on prices and pushes the whole field toward openness — good news for anyone who uses these tools. If you’d rather have software tuned for a specific job rather than a raw model, see our roundup of the best AI writing tools.

FAQ

What is DeepSeek in simple terms?

DeepSeek is a Chinese AI lab that builds large language models and releases much of its work openly. It became famous for matching top-tier reasoning performance at a much lower reported cost, with models people can download and run themselves.

What is DeepSeek R1?

DeepSeek R1 is the company’s reasoning model. It works through problems step by step before answering, which helps on math, logic and coding — and it stood out for bringing that ability into an openly available model.

Is DeepSeek better than ChatGPT?

Not across the board. DeepSeek’s edge is being open and low-cost, which suits developers. ChatGPT has a far larger feature set and ecosystem and is easier for casual users. The best choice depends on whether you value openness and cost or polish and features.

Is DeepSeek safe to use?

It can hallucinate like any chatbot, so verify important answers. Because it’s a Chinese-hosted service, some users and organizations have privacy concerns and restrict the app; running the open model locally avoids sending data to its servers. Avoid sharing sensitive information regardless of the tool.

---

The AI field moves fast and model capabilities change frequently. This explainer reflects the current landscape and is reviewed periodically.