You can get fable-ish performance with gpt 5.5 watching over opus output. Although it fundementally cannot work as well because gpt 5.5 doesn't see the thinking process behind opus 4.8 unlike fable which presumeably self-steers and is natively trained for it.

See more: https://omp.sh - turn on advisor and set advisor role to gpt 5.5 xhigh thinking.