The company itself could have access to the AI for the interview, since idea is lowering the playing field.

But even more, it seems likely someone is going to be willing to supply LLM access at not that much more than the cost of computation.

I know OpenAI's business is selling access to their stuff at a premium but since current AI is not much more than brute-forcing of massive public data, it doesn't seem like this premium will be justifiable for long.