5.6 Sol is great but there's a depth to the understanding that Fable exhibits that's unique to it currently.
Can I truly quantify this? I don't think so. Just that I spend a ton of time with various models and a certain point it's just a personal impression or a gut feeling.
In the days after Fable first came out I increased the amount of parallel planning of tasks that I was doing by 2-3x because it felt like I didn't need to be paranoid due to that handling of nuance.