Taken from CNBC’s Daily Open, our international markets newsletter — Subscribe today Artificial intelligence (in other words, " OpenAI and the companies in its ecosystem ") has been turbocharging stock markets since ChatGPT was released in 2022. The clearest example of the sustained rally we've been enjoying: In recent weeks, the S&P 500 basically hit a record close each time the index rises — even if it's a miniscule 0.05% tick upwards. That's not to say investors aren't worried about a