Straight-up FP4 KV cache with no degradation: inference engineers take note
stochasticchasm · x · 2026-09-11
Commentary on a new model architecture: the KV cache is stored directly in FP4 with no observable degradation, and KVs are compressed via CSA — with a new "pure CSA2" design replacing the odd alternating CSA/HCA dual-frequency setup of v4. Combined, the model barely uses any KV cache, which the author says will make inference engineers' lives interesting; open questions include how kernel reduction order affects performance.
Related event: Leaked DeepSeek V4.1 Flash Tech Report Reveals KV Cache-Obsessed Flagship(44 posts)→
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