According to Odaily Odaily, Rio-3.5-Open-397B, the "official" open-source model launched by IplanRIO, an IT company under the Rio de Janeiro municipal government, has become a global sensation and is hailed as a new force in Latin American open-source models. However, within 24 hours, this so-called AI "dark horse myth" reversed, with the model being accused of being a weighted hybrid version of Alibaba's Qwen3.5 and NexN2Pro.
IplanRIO has issued a public apology on the open-source community HuggingFace, admitting that it uploaded the merged baseline version used for comparison "due to operational error." The open-source model team Nex-AGI has publicly accused Rio of not showing any trace of training by Rio itself in the model from Rio's Rio de Janeiro, claiming that the so-called self-developed model is actually a weighted hybrid of NexN2Pro and Qwen3.5-397B-A17B. (HuggingFace)
