Brazil's Rio de Janeiro unveils AI model to rival ChatGPT, Claude

The government of Rio de Janeiro in Brazil has launched an AI model called Rio 3.5 Open 397B to rival models like ChatGPT and Claude. The model, developed by a municipal IT firm IplanRIO, outperformed models like Alibaba's Qwen 3.5 Plus and Deepseek V4 Pro. This comes a day after US banned Anthropic's Claude Mythos and Fable 5 for foreigners.