In January 2025, a little-known Chinese lab detonated a bomb in the AI industry. DeepSeek released R1, a reasoning model that matched OpenAI’s best on major benchmarks — reportedly trained for around $5.5 million, roughly twenty times less than its American rivals. Nvidia’s stock tumbled, DeepSeek shot to the top of the app stores, and the assumption that frontier AI required hundred-billion-dollar datacentres took a serious dent. A year on, DeepSeek is a free, open-source powerhouse that’s genuinely competitive with the giants — wrapped in privacy and censorship questions that deserve a straight answer. This review covers the consumer DeepSeek Chat app; the DeepSeek API is reviewed separately.

The models in 2026

DeepSeek’s free Chat app runs its own frontier-class models. DeepSeek-V3 (and the refined V3.2) handles general chat, writing and coding; DeepSeek-R1 powers a “DeepThink” reasoning mode that shows its full chain-of-thought, matching OpenAI’s o1 on hard maths and logic. In April 2026 the lab released DeepSeek-V4, a 1.6-trillion-parameter flagship with a 1-million-token context window that, on coding benchmarks like SWE-bench and HumanEval, trades blows with GPT-5.4 and Claude — while costing a fraction as much to run.

The defining fact about all of them is that they’re open-weight under an MIT licence. Anyone can download them from Hugging Face and run them locally with tools like Ollama or vLLM. That openness is both a technical achievement and, as we’ll see, the key to working around DeepSeek’s biggest drawback.

Features

Chat & DeepThink

The core experience is clean and fast: ask a question, optionally switch on DeepThink to watch the model reason step by step, and get genuinely strong answers on technical, mathematical and coding problems. A web-search toggle pulls in current information, and you can upload files for analysis.

Lean by design

Where ChatGPT piles on tools, DeepSeek keeps it minimal. There’s no image generation, no agents, no canvas, no app ecosystem — it’s a focused chat-and-reasoning tool. For people who just want a sharp, free brain to think with, that simplicity is fine; for those who want an all-in-one assistant, it’s a clear limitation.

Open weights = local option

Because the models are open, privacy-conscious users and businesses can self-host them — your data never touches DeepSeek’s servers. There are also smaller “distilled” versions that run on high-end consumer hardware, making private, offline use genuinely practical.

Pricing in 2026

DeepSeek is one of the cheapest ways to reach a frontier model anywhere — and for consumers, it’s simply free.

For developers and tinkerers, the price-to-performance ratio is arguably the best on the market. For everyday users, “free with no limits” is a genuinely strong offer — provided the privacy and censorship trade-offs below are acceptable for what you’re doing.

Pros and cons

Where it falls short

The headline concern is data privacy. The hosted DeepSeek app is run by a Chinese company, which means your conversations are stored in China and subject to Chinese law. A number of governments and organisations have restricted DeepSeek on official devices for exactly this reason. The widely shared advice is sensible: it’s fine for general, non-sensitive work, but don’t put confidential, client or personal data through the hosted app. The good news is that the open weights offer a genuine escape hatch — self-host the model and the data-residency problem disappears entirely.

The second issue is censorship. In line with Chinese content rules, DeepSeek declines or deflects on politically sensitive subjects — questions about events like Tiananmen Square or the status of Taiwan, for instance. For most coding and everyday queries this never comes up, but if you value unfiltered inquiry it’s a real limitation. Beyond those two, DeepSeek is simply narrower than the all-in-one assistants — no image generation, agents or polished extras — and its writing, while capable, lacks the finesse of the very best. None of this dims how remarkable its core capability is; it just defines who it’s right for.

Scorecard

How DeepSeek scores across what matters, averaging to 7.3/10:

Verdict

DeepSeek is one of the most important AI stories of the decade and, on raw capability for the price, genuinely unbeatable. If you need a free, frontier-grade brain for coding, maths and reasoning — and especially if you can self-host the open weights — it’s superb, and it has permanently changed expectations about what AI should cost. Developers and technical users will get enormous value from it.

It scores 7.3 rather than higher because the trade-offs are real and they matter: the hosted app’s data goes to China, sensitive topics are censored, and the feature set is thin. Use it freely for non-confidential technical work; keep confidential data and unfiltered research on a tool you trust. If you want comparable capability with stronger privacy, our Le Chat by Mistral review covers another open-weight option, and our Claude review, ChatGPT review and Gemini review cover the all-round leaders.

Frequently asked questions

Reviewed June 2026 by AINewsAndUpdates.com. Models, features and pricing change quickly — always confirm current details on the official site before relying on it.