I think it could be
But, I think it needs slightly different architecture / algorithms to produce results that are on part with any capability of a human being in any capacity.

I don't think we can get true AGI from GPT-4 but we will get something extremely profound and mildly world changing.

And I do think by 2025 we will have an AGI that surpasses human beings in every capacity, and then the self designing recursion will begin and the singularity will have arrived.