Here is Yuji Tachikawa from Japan (Mathematical Physics, String Theory, QFT) on recent progress in his own work using Fable 5 :
"I've been trying out Claude Fable recently, and last night, on a whim, I showed it my research notes about a collaborative project that's seen no progress in the past six months or so and asked for its thoughts. To my surprise, it made a non-trivial observation and essentially solved it."
"I was also surprised that it was using sympy to automatically write code and verify his own predictions."
"Fable probably seems like it properly understands string theory and has intuition too—that's my impression"