The open-source large model Rio 3.5 397B, developed by an IT firm operating under the auspices of the municipal government of Rio de Janeiro, Brazil, has come under fire for allegedly being a hybrid model. Nex-AGI, through rigorous mathematical scrutiny, has asserted that roughly 60% of the model's foundational elements trace back to Nex N2 Pro, while the remaining 40% are derived from Alibaba's Qwen 3.5. Upon eliminating the system prompt, there's a 79% likelihood that the model will identify itself as 'Nex from Nex-AGI' and reiterate a tailored narrative. Further statistical examination uncovers that the model's network layers and components display an exact blending ratio of 0.6 and 0.4, with a statistical deviation that soars into the thousands of standard deviations. In response, the Nex team contended that the accusations from the opposing side inadvertently highlight the robustness of their technology. They also underscored the importance of adhering to ethical standards within the open-source community, particularly concerning proper attribution and acknowledgment when leveraging their technological advancements.