The Globe and Mail reports in its Monday edition that Thomson Reuters tested OpenAI's GPT-3 artificial-intelligence language model in the summer of 2020 on a battery of legal research questions to see how it compared with Westlaw, the company's flagship on-line research product for lawyers. The Globe's James Brashaw quotes chief product officer David Wong saying, "It failed miserably, actually, at legal research." But when an updated model called GPT-3.5 was released two years later, and more sophisticated versions started appearing every several months, Thomson Reuters ran the same tests again and again. "And the F student that we saw in 2020 graduated to a C-minus student with GPT-3.5 and then to a B or B-plus student with GPT-4," Mr. Wong said. He now predicts that in three to five years, every professional will have a generative AI assistant. The speed of development and the level of investment in artificial intelligence have exploded in recent years, with hundreds of billions of dollars pouring into the sector, and trillions more predicted to follow. That has fuelled an AI mania, mixing hype with anxiety about the many ways the technology may -- or may not -- transform large swaths of the economy and work force.