The Mystery 'Ox Alpha' Model Was GLM-5.3-Flash All Along, and Z.ai Shipped It Under MIT

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Z.ai released GLM-5.3-Flash on August 26 as a 320B-A18B MoE, natively multimodal, FP8-native, with a 1,048,576-token context — and confirmed on X that it is the model previously fingerprinted in the wild as 'Ox Alpha,' trained entirely on Chinese AI chips. The MIT license is the notable part: a frontier-adjacent multimodal model with no field-of-use restrictions, claimed within half a point of Claude Opus 4.8 on Z.ai's internal coding benchmark at roughly one-tenth the price of GLM-5.2. For builders, this is the first MIT-licensed model in this capability class you can legally fork, fine-tune, and resell.