DeepSeek Unveils Flagship AI Model a Year After Breakthrough

A year after rattling Silicon Valley with its technology, China’s DeepSeek rolled out preview versions of a new flagship artificial intelligence model, calling it the most powerful open-source platform in a challenge to rivals from OpenAI to Anthropic PBC.

The Chinese startup unveiled the V4 Flash and V4 Pro series, touting top-tier performance in coding benchmarks and big advancements in reasoning and agentic tasks. They come with architecture upgrades and optimization improvements, the startup said on Hugging Face. DeepSeek singled out a technique it dubbed Hybrid Attention Architecture, which it said improves the ability of an AI platform to remember queries across long conversations. It also pushed the 1 million-token context window — a leap that allows entire codebases or long documents to be sent as a single prompt.