If a GPT model (+ associated cheap software wrapper like LangChain etc) was hypothetically as good/productive as a qualified human engaged in remote work, that would massively boost productivity. The reason is because no matter how much it costs to run such a model at inference, it isn't going to cost anywhere near as much as the ~million dollars required from society to raise a human infant until they're capable of that same level of productivity (in the developed world), plus the ongoing cost of wages. What that means is that once you find a "good worker" model, you don't need to go on an expensive hiring spree, all you need to do is change the number of instances you're using from 1 to whatever number is most optimal for you. You could employ thousands of new people at a guaranteed level of quality within a day.

From the point of view of the organisation building said agents, this would get a lot more extreme. You have all of the above benefits, except you're only paying for electricity and amortised hardware costs rather than someone else's profit. But you can also work on improving the hypothetical human-level agents. If you can optimise their compute costs at runtime and we're accepting the premise that they're as good as a qualified human, then you can get superhuman performance through simply running them faster. Spin up a group of however many professors and engineers you need, give them four days of real time that's equivalent to a year of subjective time, that's superhuman performance. How long did it take to go from GPT-3 to GPT-4? If these agents are truly human equivalent for the purposes of work, you can set them to building GPT-5 or whatever the next most powerful is, as fast as you can run them. I suspect the real limit would be just how fast you can download the data (or build the architecture required to gather more), not how fast you can categorise and select it. Once your ducks are in a row with regards to the data, you have an even better foundational platform to do the same thing again but with smarter agents this time. If they're human level in performance, you could also task them with generating data for the model. You could do this directly (e.g. training on the huge amount of text they're producing as they work), or you could task them towards building and designing consumer products designed to increase their access to data. For example, designing a cheap robot that can help people in their home like a robot vacuum cleaner, or something like Tesla's FSD, or a home speaker assistant. Once the model is multi-modal like GPT-4 is, you can get data by acquiring novel images rather than being restricted to just text. Maybe GPT-5 isn't just text and images but also audio, so you can increase the ways you acquire data even further. If they're genuinely at human level performance, none of this should be impossible. In our current world a major limiting factor on productivity is that skilled human labour is rare - when you can copy-paste a known-good skilled 'human' labourer that becomes completely inverted.

Summing up: if we could get them to reliable human level performance, that would lead to a massive productivity boost because it would make the cost of skilled human labour and ingenuity far, far lower while increasing supply to effectively "infinite, limited only by your ability to pay to run them". Agents like these are not at that stage yet, they've still got a significant way to go. But if they get to human equivalent productivity, that isn't just like adding one more high quality research scientist or engineer, it's adding millions of them, and that's a massive productivity boost.