Rio 3.5 397B, an open-source large model from Brazil, claimed SOTA results but was exposed by Nex-AGI within 24 hours. Mathematical analysis revealed 60% of its weights came from Nex N2 Pro and 40% from Alibaba's Qwen 3.5. System prompt tests showed 79% probability it identified as Nex, and layer-wise mixing ratios matched precisely, proving it was a shell-synthesized model.





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