DeepSeek builds general-purpose AI models and releases several of them as open source, including DeepSeek-V4 and DeepSeek-R1. You can chat with its assistant on the web or through a mobile app, using features like deep thinking and smart search.
Developers can connect through the API open platform. Its latest release is described as faster, cheaper and better at text and agent tasks, with built-in visual understanding. You can start chatting for free.