I gotta laugh at your thought process: knowing Fable 5 is a large frontier model, you're telling me that the first thing that came to your mind on seeing that model name is that it's a quantized version of Fable? As opposed to a distillation/fine-tuning on Fable responses?
Don't make fun of people you think are ignorant, it's a pretty shitty look
Well to be fair here... the title of this post doesn't mention fine tuning, it mentions quantization.