My Fable weekly limit is at 15% used already, 5.6 Sol at 3% used. And this is with the Max 20x plan compared to Codex 5x.
I don't work on the same tasks to compare them objectively, but GPT 5.6 on xhigh seems much cheaper. Essentially unlimited usage.
The gap between Opus 4.8 and Fable is large enough to drive a GPT 5.6 sized bus through. A better Opus would take some of the heat off.
Otherwise I am not interested.
Supposedly Fable 5.1 is in the later stages of the release pipeline, maybe it takes back the crown from OpenAI, who are now rumored to launch GPT 6 in August.