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

Description00INDEXopened on Jun 14, 2026Issue body actionsprefeitura-rio/Rio-3.5-Open-397B is presented as an original 397B model trained by IplanRIO. 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: With Rio's hard-coded "You are Rio" system prompt removed, its own deployed model identifies itself as "Nex, from Nex-AGI" 79% of the time — and as "Rio" 0% of the time. It even recites our organization's bespoke backstory word-for-word.

Every weight tensor in Rio is, to thousands of standard deviations, the same 0.6/0.4 blend of Nex and Qwen — across all 60 layers and every component of the network.

Other finetunes cannot be explained as interpolations. Below is the evidence. Judge for yourself.

Reactions are currently unavailable Description00INDEXopened on Jun 14, 2026Issue body actionsprefeitura-rio/Rio-3.5-Open-397B is presented as an original 397B model trained by IplanRIO. 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: With Rio's hard-coded "You are Rio" system prompt removed, its own deployed model identifies itself as "Nex, from Nex-AGI" 79% of the time — and as "Rio" 0% of the time. It even recites our organization's bespoke backstory word-for-word.

Every weight tensor in Rio is, to thousands of standard deviations, the same 0.6/0.4 blend of Nex and Qwen — across all 60 layers and every component of the network.

Other finetunes cannot be explained as interpolations. Below is the evidence. Judge for yourself.

Reactions are currently unavailable 00INDEXopened on Jun 14, 2026Issue body actionsprefeitura-rio/Rio-3.5-Open-397B is presented as an original 397B model trained by IplanRIO. 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: With Rio's hard-coded "You are Rio" system prompt removed, its own deployed model identifies itself as "Nex, from Nex-AGI" 79% of the time — and as "Rio" 0% of the time. It even recites our organization's bespoke backstory word-for-word.

Every weight tensor in Rio is, to thousands of standard deviations, the same 0.6/0.4 blend of Nex and Qwen — across all 60 layers and every component of the network.

Other finetunes cannot be explained as interpolations. Below is the evidence. Judge for yourself.

Reactions are currently unavailable 00INDEXopened on Jun 14, 2026Issue body actionsprefeitura-rio/Rio-3.5-Open-397B is presented as an original 397B model trained by IplanRIO. 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: With Rio's hard-coded "You are Rio" system prompt removed, its own deployed model identifies itself as "Nex, from Nex-AGI" 79% of the time — and as "Rio" 0% of the time. It even recites our organization's bespoke backstory word-for-word.

Every weight tensor in Rio is, to thousands of standard deviations, the same 0.6/0.4 blend of Nex and Qwen — across all 60 layers and every component of the network.

Other finetunes cannot be explained as interpolations. Below is the evidence. Judge for yourself.

Reactions are currently unavailable 00INDEXopened on Jun 14, 2026Issue body actions 00INDEXopened on Jun 14, 2026Issue body actions 00INDEXopened on Jun 14, 2026 00INDEX 00INDEX opened on Jun 14, 2026 on Jun 14, 2026 on Jun 14, 2026 Issue body actions Issue body actions Issue body actions prefeitura-rio/Rio-3.5-Open-397B is presented as an original 397B model trained by IplanRIO. 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: With Rio's hard-coded "You are Rio" system prompt removed, its own deployed model identifies itself as "Nex, from Nex-AGI" 79% of the time — and as "Rio" 0% of the time. It even recites our organization's bespoke backstory word-for-word.

Every weight tensor in Rio is, to thousands of standard deviations, the same 0.6/0.4 blend of Nex and Qwen — across all 60 layers and every component of the network.

Other finetunes cannot be explained as interpolations. Below is the evidence. Judge for yourself.

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