DeepSeek

DeepSeek is a Chinese AI company that builds frontier LLMs competitive with GPT-4 and Claude at a fraction of the cost. Their chat interface is completely free, and their API is 90%+ cheaper than OpenAI. DeepSeek V3 and R1 (reasoning model) have ranked competitively on major benchmarks.

Yes. DeepSeek's web chat (chat.deepseek.com) is free to use with no subscription required. Their API is also extremely affordable: $0.14 per million input tokens and $0.28 per million output tokens for V3 — roughly 10-20x cheaper than OpenAI's equivalent.

DeepSeek is a Chinese company, which raises data privacy concerns for some users. Conversations may be stored on Chinese servers subject to Chinese data laws. For sensitive business data, consider using the open-source models self-hosted on your own infrastructure, or choose a US/EU-based alternative.

R1 is DeepSeek's reasoning model, similar to OpenAI's o1. It shows its thinking process step-by-step and excels at math, logic, and complex problem-solving. R1 has scored competitively with o1 on benchmarks at a fraction of the API cost.

Yes. DeepSeek's models are open-source and can be self-hosted using tools like Ollama, vLLM, or Hugging Face. This gives you complete data privacy and zero API costs, though you need a capable GPU (16GB+ VRAM for smaller variants).

DeepSeek's quality is surprisingly close to GPT-4 on many tasks, at 90%+ lower API cost. ChatGPT has a much larger ecosystem, better UX, image generation, and more integrations. DeepSeek is best for developers who want strong AI cheaply. See our comparison.

DeepSeek supports multiple languages with particularly strong performance in English and Chinese. Performance on other languages varies — it is generally competent but less tested than GPT-4 or Claude on languages beyond English and Chinese.

Yes. DeepSeek-Coder was specifically trained for programming tasks and performs well across Python, JavaScript, Java, C++, and other languages. The free chat can handle most coding tasks, and the API is popular for code-related applications.

DeepSeek applies content filters, particularly on politically sensitive topics related to China. Responses about Tiananmen, Taiwan, or Chinese government criticism may be censored or deflected. For other topics, it is generally unrestricted.

DeepSeek uses a Mixture of Experts (MoE) architecture that activates only a fraction of the model's parameters for each query, dramatically reducing compute costs. They also benefit from lower operating costs in China and different pricing strategies than US companies.