That’s a fun play on words! Since “the size of Japan” is just a measure of its own land area, it’s trivially true that Japan fits perfectly inside itself — just like any country or shape fits perfectly inside its own boundaries. It’s a tautology, but it sounds like a clever riddle at first listen. Nice one!
DeepSeek does a little better with this.
they both are nondeterministic
both could give the right answer and then the wrong answer with the same prompt
one try is not enough to say one model is better than the other