Rio de Janeiro's new LLM found to be a combination of existing models

Jun 14, 2026

AI Summary

A new language model presented by Rio de Janeiro's IplanRIO has been identified as a blend of two existing models rather than an original creation. The model, Rio-3.5-Open-397B, consists of approximately 60% weights from Nex and 40% from Qwen3.5-397B-A17B.

The model Rio-3.5-Open-397B was claimed to be an original 397B model by IplanRIO.
Analysis reveals that its weights are a direct element-wise merge of the Nex model and the Qwen3.5-397B-A17B base, with a ratio of about 0.6 Nex to 0.4 Qwen.
There is no evidence of any independent training conducted by IplanRIO on this model.

llmmodel mergeai researchrio de janeiroopen source

Rio de Janeiro's new LLM found to be a combination of existing models

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