Elon posted this prediction 27 months before ChatGPT existed. Most people's mental clock for AI starts on November 30, 2022, the day ChatGPT launched. By then this tweet was already two years old. GPT-3 had been sitting in an API since June 2020, and the only people using it were developers and a handful of startups building on top of it. So when Elon wrote that GPT-5 or 6 could be indistinguishable from the smartest humans, maybe a few thousand people on earth had enough context to evaluate…