DeepSeek-V4.1-Flash
DeepSeek's 552-billion-parameter mixture-of-experts model, released 10 September 2026, and the smallest in a new architecture family with native visual understanding. A Causal Encoder-Decoder design activates just 8 billion parameters for input and 16 billion for output, and cuts KV cache memory to a quarter of the previous generation, which DeepSeek passes on as lower API prices while phasing out DeepSeek-V4-Pro.
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