
Chinese AI lab DeepSeek unveiled two preview versions of its DeepSeek V4 large language model—V4 Flash and V4 Pro. Both feature 1-million-token context windows and mixture-of-experts architecture. V4 Pro contains 1.6 trillion parameters (49 billion active), making it the largest open-weight model. DeepSeek claims both models nearly match frontier AI systems on reasoning benchmarks and outperform OpenAI GPT-5.2 and Gemini 3.0 Pro on specific tasks.