The AI has gotten substantially worse. With Astra and Fable I am no longer able to finish tasks I used to be able to do and I revert to older models. Latest models go into reasoning loops, commit logic errors routinely and cannot even spot them by themselves and many more.

For instance I have been trying to come up with generalised model of certain non-linear behaviour and had Astra working on it for 4 days. It produced unusable garbage and gave up. Sol has got alright result in a day. Opus 5 seemed like was doing something but explanations were English like gibberish. I have not tried Fable on it, because it was a car crash in previous similar task.