My jaw drops every day.
Small change in comparison, but today Fable created and benchmarked an RTree which was 100x faster to populate and 5x faster to query, compared to a previous attempt with Opus 4.6 a couple of months ago. That took about two coffees.
I think it's important to remember that as impressive Opus & co are, they're standing on the shoulders of giants, i.e. the engineers, academics and companies who have cooperated to design the incredible programming languages and machines we have today.