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Rio de Janeiro's "homegrown" LLM appears to be a merge of an existing model

Hacker News · Jun 14, 2026, 3:37 PM

It is not. Its weights are a direct element-wise merge of our model, Nex, with the official Qwen3.5-397B-A17B base — about 0.6 Nex / 0.4 Qwen — and we find no evidence of any training of their own. We can show this two completely independent ways:

Below is the evidence. Judge for yourself.

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