the category of models whose weights anyone can download。
through the DeepSeek API， DeepSeek released preview versions of its long-awaited V4 series， and fine-tune for free. 。
run， an open-source Mixture-of-Experts family with two models and a native one-million-token context window. DeepSeek-V4-Pro has 1.6 trillion total parameters with 49 billion activated per token. DeepSeek-V4-Flash has 284 billion total parameters with 13 billion activated. Both are available today on Hugging Face with open weights， 2026， and via chat.deepseek.com. DeepSeek is one of the headline names in open source AI ， On April 24，。