Does that mean it's intelligent?

To me it just means they can brilliantly fake human conversation - the original design goal of Large Language Models.

It's really easy to tell if you're talking to an LLM if you ask a question that requires actually knowing things, not going for the first search result of a tool call or whatever most popular answer was embedded in the weights.

For this reason even the most sophisticated models still require system prompts, skills and all that other crap.