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Z.ai confirmed that the mysterious Ox Alpha model belongs to the company and released it under the name GLM-5.3-Flash, making its weights available through Hugging Face. The model targets programming and long-term agentic tasks and is based on 320 billion parameters, with around 18 billion activated per query and a context window of up to one million tokens.
Parviz Sayed Mohammed believes that Z.ai's GLM-5.3-Flash model requires rethinking the allocation of AI workloads, thanks to its low cost and open weights. He proposes dividing tasks into three spending tiers, directing about 45% of task volume to the low-cost model after testing it in practice.