Jordi Ribas hasn’t taken a day off since last September. That month, the Microsoft search and AI chief got the keys to GPT-4, a then secret version of OpenAI’s text-generation technology that now powers ChatGPT. As Ribas had with GPT-4’s predecessors, the Barcelona native wrote in Spanish and Catalan to test the AI’s knowledge of cities like his hometown and nearby Manresa. When quizzed about history, churches, and museums, its responses hit the mark. Then he asked GPT-4 to solve an electronics problem about the current flowing through…