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GLM 5.3 FlashX

Z.ai (Zhipu AI), 18 Sep 2026. Too new for Epoch AI’s data: listed by OpenRouter the day its API went live, with no compute estimate yet.

Lab
Z.ai (Zhipu AI)
Released
18 Sep 2026
Kind
Language
Training compute
Not estimated yet
Parameters
Not disclosed
Organisations
Z.ai (Zhipu AI)
Country
China

Data: Epoch AI (Creative Commons Attribution), releases too new for it from OpenRouter, and METR. Updated 25 Sep 2026.