I love this type of benchmarking, especially when it to me was counter intuitive that astra missed it. Got a couple of nice prompts and things to think about for my own tax making moving to a new country, but honestly hard for most people to review if they got the optimal output from taxes.

Since it's really a proving game, you can optimise and take more risks with declaration, and some of it has to be proven in an audit. Tried getting data on the risks, how old cases were ruled but ultimately by accountant gave a fairly different view compared to Opus 5 at the time.