AI shows signs of general intelligence (e.g. can generate proper text in generated pictures) after about 20 billion of parameters. IMHO, 1 trillion of parameters can be enough to simulate human-like behaviour after reading lot of text, watching of lot of video, and playing lot of games and robotic simulations. It will be able to understand commands, understand video and audio from cameras, will be able to control equipment and robots, e.g. to repair itself, to reach a goal.