DeepSeek is an artificial intelligence brand associated with an AI research lab developing open-weight language models. Its models are designed for reasoning, coding, mathematics, and multilingual conversation, with options including DeepSeek-V3. 2, DeepSeek-R1, DeepSeek-V3, DeepSeek-Coder, DeepSeek-VL, and distilled models in different sizes.

The brand’s free AI chat service gives users access to an assistant for writing and editing, coding support, step-by-step math help, research summaries, planning, and everyday questions. Users can refine responses through follow-up prompts and adapt the tone or format to their needs. The service is presented as requiring no account, subscription, or credit card, and works through a responsive web interface on desktop, tablet, and mobile.

It also offers model information, example prompts, usage guidance, and frequently asked questions. DeepSeek describes its technology as using Mixture-of-Experts architecture and highlights features such as a 128K-token context window and support for more than 50 languages. The site notes that the chat cannot browse the internet in real time or access files unless users provide the content