What does it mean when its reported that openAI is close to solving a millennial prize problem?

Reddit r/singularity News

Summary

The article questions what it means when reports state that OpenAI is close to solving a Millennium Prize problem, highlighting the challenge of knowing progress on complex unsolved mathematical problems.

I keep seeing stated plainly that they are close to solving. If these are complicated problems that we don't know the solution to then how do we know if we're close to solving them?
Original Article

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