Using the paid anthrotpic models daily, it has not been my experience that they are just fixing public examples of foolishness, but are generally getting smarter. For example I have my own private, obscure bike racing physics test I use that the newer low tier models pass now.
Before fable, the top tier models didn't pass it. Now even Haiku at low effort does.
Before fable, the top tier models didn't pass it. Now even Haiku at low effort does.