[Question] Does the USG have access to smarter models than the labs’?

People in the AI space, myself included, seem to typically believe that the smartest models that exist today were trained by scaling labs.

But I have met non-AI people who believe that the US government likely has access to secret models more powerful than the labs’.

What is the best evidence either way? If (as I expect) the current evidence points towards today’s smartest models having been trained by labs, what evidence should I look out for in the future that would indicate that the situation had changed?