You can see the Pareto Frontier well in DeepSWE's chart here - https://deepswe.datacurve.ai/

ChatGPT 5.6 Luna on the right (cheaper) cover most of the frontier, with a point for Deepseek flash, and higher performance overlapping heavily between 5.6 Sol and Fable.

That DeepSeek point will probably move back towards Luna as deepseek announced a "significant" price increase coming to their API [1], which kind of demonstrates that beating the Pareto frontier is where the difficulty actually is).

[1] https://www.bloomberg.com/news/articles/2026-08-06/deepseek-...