Search the topic. It is historically documented. It might no longer be true though.

A way to test might be running an open model locally, directly (without a harness) where you could be sure it's not going through a translation layer. I think these days it might have this tool call behavior built in, but I think back in the day it was treated more like a magic trick. Without it, it behaved similar to "how many r's are in strawberry" for simple math.