Rio de Janeiro ships an open AI model built on Qwen
IplanRIO put Rio 3.5 Open 397B on Hugging Face with MIT licensing, a 1M-token context claim, and self-reported gains over Qwen's base model.
By Ryan Merket · Published · Updated
Primary source: X / SemiAnalysis
Why it matters
A city government publishing a 397B-class open model shows how Qwen-based post-training is moving frontier-style AI work beyond private labs and cloud platforms.
Rio de Janeiro's municipal IT company, IplanRIO, has released Rio 3.5 Open 397B, a large open-weight AI model post-trained from Alibaba's Qwen 3.5 397B base model.
ELI5: Rio de Janeiro's city IT agency took a huge open AI model from Alibaba's Qwen, tuned it with a reasoning-efficiency method, and published the weights for others to inspect or run. The big question is whether its self-reported gains hold up when independent teams test it.…
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