DeepSeek-V3 is an open-source large language model with 671 billion total parameters, activating 37 billion for each token. It provides free access to advanced AI capabilities either through an online demo requiring no registration or via local installation for developers and researchers. The model supports a context length of 128K tokens and is permissively licensed for commercial use. Key features include state-of-the-art performance comparable to leading closed-source models, easy API integration, and full source code on GitHub. Users can try it instantly in a browser or download the base and instruct models from Hugging Face.