I gave playing 20Q with the GPT-4 version, and it did surprisingly well. It didn't quite get it in 20 questions, and correctly gave up once it hit that, but it was almost at my object (a computer power supply). Given what it was asking, I expect it would get it in one of two more questions. It's just one sample, but it asked the right questions to narrow the field to computer-related things, and then narrowed down to power-related things, with its final guess being a UPS.