Global AI 'Dark Horse Myth' Overnight Reversal: Accused of Trapping Alibaba's Shell Odaily Planet Daily News: The "official" open-source model Rio-3.5-Open-397B, launched by IplanRIO, an IT company under the Rio Municipal Government in Brazil, has become globally popular and is regarded as a new force in Latin American open-source models. In less than 24 hours, the so-called AI "dark horse myth" was reversed, and the model was accused of being a weighted hybrid version of Alibaba Qianwen Qwen3.5 and NexN2Pro that was "nested". Currently, IplanRIO has publicly apologized on the open source community HuggingFace, admitting to uploading a merged baseline version for comparison "due to operational errors". The open-source modeling team Nex AGI publicly accuses that there is no trace of Rio's own training on this model in Rio, Brazil. The so-called self-developed model is actually a weighted hybrid version of NexN2Pro and Qwen3.5-397B-A17B.