alt Hacker NewsFable is much better at handling nuance. Opus/GPT 5.6 Sol are much more likely to miss the point you are trying to make, emphasise the wrong thing, exaggerate the importance of unimportant details, or introduce contradictions.
That said, Fable is still not a great writer, largely driven by it not knowing what it should exclude, and it still having the usual LLM-isms. But it’s better.
That's really what got everyone hooked in the first place.
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.