Rio de Janeiro Shipped an AI Model That Topped DeepSeek—But Was Based on Someone Else's Work
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Rio de Janeiro's IplanRIO released Rio 3.5 on June 13.
Key facts
The math was exact: Rio 3.5 ≈ 0.6 × Nex N2 Pro + 0.4 × Qwen 3.5
The team analyzed the weights, and the recipe is exact: Rio 3.5 ≈ 0.6 * Nex N2 Pro + 0.4 * Qwen 3.5
Nex N2 Pro, released days before Rio 3.5, scores 75.3% on Terminal-Bench 2.1—higher than Rio's 70.8%
So composer 2 is Kimi K2.5 with RL at least rename the model ID pic.twitter.com/fyUWbo1InF
Summary
IplanRIO released Rio 3.5 Open 397B on June 13, billing it as a government-built frontier AI model with benchmark scores topping Qwen 3.7 Plus. AI company Nex published a mathematical proof showing the model is a direct 0.6 Nex / 0.4 Qwen weight merge. IplanRIO updated the model card, credited Nex, pulled the benchmark claims, and blamed an "incorrect upload. Rio 3.5’s launch timing was perfect: Brazil was playing its World Cup opener, and social media was already on fire.