Rio-3.5-Open-397B, presented as an original 397B model by IplanRIO, is a direct element-wise merge of Nex-N2_pro and Qwen3.5-397B-A17B at a 0.6 to 0.4 ratio. No evidence of any original training was found. The discovery was made through two independent verification methods.
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Anthropic Launches Mythos With Six Features You Absolutely Need