I did work around this last year and there was no limit to how smart you could get a swarm of agents using different base models at the bottom end. This at the time was a completely open question. It's still the case that no one has build an interactive system that _really_ scales - even the startups and off the record conversations I've had with people in these companies say that they are still using python across a single data center.
AGI is now no longer a dream but a question of if we want to:
1). Start building nuclear power plants like it's 1950 and keep going like it's Fallout.
2). Wait and hope that Moore's law keeps applying to GPUs until the cost of something like o3 drops to something affordable, in both dollar terms and watts.