Without paper and architecture, GPT-4 (GPT-3+1) could be just a marketing gimmick to upsell it and in reality it is just microservices of existing A.I models working together as AIaaS (A.I. as a service)
At this point, if it goes from being in the bottom 10% on a simulated bar exam to top 10% on a simulated bar exam, then who cares if that's all they're doing???