DeepSeek debuts DeepSeek-V4.1-Flash, its smallest model built on a new Causal Encoder-Decoder architecture, with 552B backbone parameters and 1M-token context (Reuters)

DeepSeek introduced DeepSeek-V4.1-Flash, a compact model built on a new Causal Encoder-Decoder architecture that retains a 552-billion-parameter backbone while supporting a 1 million-token context window. The design targets efficiency without sacrificing the large-scale reasoning capabilities of its larger predecessors.