Deep Dive into Zhipu GLM-5.3-Flash: Architecture Overhaul and Domestic Infrastructure Breakthrough
赛博禅心 · wechat · 2026-08-26
Zhipu's GLM-5.3-Flash (aka Ox-Alpha) offers exceptional performance and cost-efficiency. The 321B parameter model features a redesigned hybrid attention architecture, reducing activated parameters to 18B, cutting attention computation by 3x, and KV cache by 4x. Key innovations include the IndexPool technique for compressing index vectors and mHC technology for future scaling. It is backed by a cluster of 100,000 domestic chips, utilizing an EPD (Encode-Prefill-Decode) separated architecture and InfraAgent optimizations to triple end-to-end service performance, proving the viability of domestic chips for large-scale inference. The model natively supports multimodality, excelling in code generation (e.g., recreating Terraria), pixel-perfect UI restoration, 3D modeling, and video understanding. It is currently open-source with a limited-time 50% discount.
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