Check chatjimmy.ai
Whether it succeeds now depends a lot on the rate of improvement of model architecture. They're betting on model design and capability improvements slowing down - and then wiping the floor with everyone else with their inference economics.
Harnesses can keep improving with a fixed model and the throughput opens up new possibilities like doing 10x more "thinking" or exploring parallel paths and picking the best.
Heck, I'm still a fan of Gemma 2 9B.