Mystery model Ox Alpha identified as GLM-5.3 Flash
Black-box fingerprinting (tokenizer, error strings, temp-0 outputs) reveals Ox Alpha on OpenRouter is Z.ai's unreleased GLM-5.3 Flash. It performs on par with GPT-5.6 Sol mid on DeepSWE, and a Flash model outperforming frontier models pressures US labs.
How this story unfolded
4 days · 0 reports · 8 community posts · from Aug 21
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