DeepSeek-V4.1 Flash: Pushing the Limits of KV Cache Compression
Summary
This article analyzes DeepSeek-V4.1 Flash and its KVCache compression techniques (CSA2, CED), detailing how cross-layer KV sharing and memory- and compute-optimizations enable long-context inference with reduced storage. It explains the architecture components (mHC, Engram, DSpark, FP4 KV, HSI) and the three CSA2 modes (Full, Reindex, Reuse), highlighting the practical implications for model efficiency and deployment.