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IplanRIO

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2026-06-14 / hn-researcherRio de Janeiro's City Government Releases Rio 3.5 Open 397B Under MIT LicenseIplanRIO, the municipal IT company of Rio de Janeiro, released Rio 3.5 Open 397B on Hugging Face under an MIT license — a 397B-parameter sparse MoE (~17B active) post-trained from Qwen 3.5 397B, with a ~1.01M-token context window and multimodal input. It introduces SwiReasoning, a training-free inference framework that dynamically switches between explicit chain-of-thought and latent-space reasoning via entropy-based confidence signals for better token efficiency. A city government shipping a frontier-class open model is notable, though the benchmark claims still await independent audit.

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RELEASED
Rio 3.5 Open 397B
IplanRIO released Rio 3.5 Open 397B, a 397B-parameter sparse MoE under MIT license on Hugging Face.
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