To your slow point: I did a quick eval for a data viz task to do a qualitative comparison and Fable was much faster (by 4x), but I struggle with the "token inefficiency" as a sort of whatever metric.

Kimi was half the cost and produced a near identical output.

https://fr4geiw93g.evvl.io/

On a fairly simple coding task Kimi was 2x the cost and 7x as slow (and gpt-5.6-sol was even cheaper).

https://r26pakjmhv.evvl.io/