What is DeepSeek: The Chinese AI Challenging ChatGPT and How It Works

The Chinese AI startup that shook the industry

In a sector dominated by giants like OpenAI, Google and Anthropic, DeepSeek has burst onto the scene as one of the most striking stories of recent years. Founded in 2023 by Liang Wenfeng and headquartered in Hangzhou, China, DeepSeek is an artificial intelligence company that develops open-source language models with capabilities that directly rival the best in the world.

What distinguishes DeepSeek from other competitors is its core promise: delivering performance comparable to GPT-4 at a fraction of the cost. And it is not empty marketing — its models have demonstrated through independent benchmarks that it is possible to build frontier AI without spending hundreds of millions of dollars.

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DeepSeek's models

DeepSeek has released two main models that have captured global attention:

DeepSeek-V3

This is the company's multi-task model, optimized for:

• Text generation and conversation
• Programming and technical problem solving
• Document summarization and analysis
• Mathematical and logical reasoning

V3 uses a Mixture of Experts (MoE) architecture, which activates only a portion of its parameters per query, making it much more efficient than traditional dense models.

DeepSeek-R1

This is the model specialized in deep reasoning. Inspired by chain-of-thought prompting, R1 breaks complex problems into logical steps before delivering a response. This makes it especially powerful for:

• Advanced mathematics
• Complex programming
• Logic and science problems
• Data analysis

R1 is the model that has surprised the most because in multiple reasoning benchmarks it surpasses GPT-4o and approaches the level of OpenAI's o1.

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How DeepSeek works under the hood

DeepSeek's technical innovation is based on several key principles:

Mixture of Experts (MoE) Architecture

Unlike a "dense" model that uses all its parameters every time, MoE divides the model into multiple expert networks. Only the modules necessary for each task are activated, drastically reducing computational cost without losing quality.

Efficient Training

DeepSeek has optimized training processes that traditionally require thousands of GPUs for months. Their team has demonstrated that with innovative parallelism and optimization techniques, frontier-level results can be obtained with significantly fewer resources.

Chain of Thought Reasoning

The R1 model uses chained reasoning: instead of responding directly, it analyzes the problem step by step, evaluates alternatives, and arrives at a well-founded conclusion. This produces more accurate responses on complex tasks.

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DeepSeek vs ChatGPT vs Claude: quick comparison

Feature	DeepSeek R1	ChatGPT (GPT-4o)	Claude 3.5
Logical reasoning	Excellent	Very good	Very good
Programming	Excellent	Excellent	Excellent
Multimodal (voice, image)	Limited	Complete	Partial
Free access	Yes, full	Yes, with limits	Yes, with limits
Open source	Yes	No	No
API cost	Very low	High	Medium
App ecosystem	Basic	Extensive	Growing
Privacy	Data in China	Data in US	Data in US

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How to start using DeepSeek today

1. Go to deepseek.com and create a free account.
2. Type a question or request in the chat, just as you would with ChatGPT.
3. Enable R1 mode if you need deep reasoning (mathematics, complex code, logical analysis).
4. Compare results with other AI tools to evaluate the quality yourself.

No credit card or installation required. Everything works from the browser.

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Strengths and limitations

Strengths

• Free with no significant limits on web chat
• Open source: you can run the models on your own server
• Exceptional efficiency: frontier performance at minimum cost
• Deep reasoning with R1 comparable or superior to premium models
• Very affordable API for developers

Limitations

• Limited multimodal: not as solid as ChatGPT for voice or image generation
• Smaller ecosystem: fewer third-party tool integrations
• China-based: legitimate privacy and censorship concerns depending on user location
• Smaller community: fewer tutorials and resources in English
• Less polished interface than established competitors

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Veredicto

DeepSeek is one of the most important AI tools to appear in recent years. It not only demonstrates that AI innovation is not reserved for large American tech companies, but also offers a free, powerful, and open alternative that will benefit users and developers worldwide.

If you are looking for an AI tool for programming, reasoning, or working with complex texts, DeepSeek deserves a place in your workflow. Especially if you value the privacy of running models locally or if you simply want a free alternative to ChatGPT without compromises.

Want to learn more? Read our guide on what is ChatGPT to compare, discover what is an LLM to understand the underlying technology, or explore the best free AI tools of 2026 to broaden your horizons.