Zhipu Open Sources GLM-5.3 Flash: Efficient 320B Model Ties Claude Opus
量子位 · wechat · 2026-08-27
Zhipu AI has officially open-sourced GLM-5.3 Flash, the model previously known as the mysterious "OxAlpha" that went viral overseas. Featuring 320B total parameters but only 18B active parameters due to a hybrid linear and sparse attention architecture, the model compresses layers to just 45. It scores 57 on the AA leaderboard, tying with Claude Opus 4.8, but at just 1/40th of the cost. GLM-5.3 Flash is the first natively multimodal model in Zhipu's 5 series, capable of long video understanding, visual coding, and 3D scene construction, with all inference traffic supported by domestic chips. This release marks a significant breakthrough for Chinese models in efficient architecture, open-source ecosystems, and domestic computing adaptation.
Related event: Zhipu Open-Sources GLM-5.3-Flash: 320B MoE Multimodal at 1/10th the Cost(48 posts)→
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