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. The release was spotted Saturday by SemiAnalysis (@SemiAnalysis ), which noted the unusual source of the model: not a frontier AI lab, cloud provider, or venture backed startup, but the city government of Rio de Janeiro. The Hugging Face organization behind the upload is listed as "Prefeitura do Rio de Janeiro (City of Rio de Janei...
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