Zhipu AI releases GLM-5.3-Flash, the model behind Ox Alpha

Zhipu AI's GLM-5.3-Flash, previously the stealth model Ox Alpha, is now official: a 320B-A18B multimodal model with a 1M-token context window, released under the MIT License. It scores 57 on the Artificial Analysis Intelligence Index at $0.09 cost per task, with pricing at $0.15 per million input tokens and $0.50 output.