For really hard problems (maths) it's far far worse than Fable 5, not even as good as Sol 4.6. Current benchmarks are inadequate as they fail to capture how much worse Opus 5 is than Fable 5.
I agree, Opus 5 is terrible. Worse than Opus 4.8.
I agree, Opus 5 is terrible. Worse than Opus 4.8.