Been using Opus 5 exclusively for a week. For the first 2 - 3 days, I had a hard time working with the output and especially understanding what it was trying to say.

There's probable more work needed in the domain to help explain things.

The other thing I noticed is that it is actually incredible and what it does. It took me longer to way longer to understand the details, then it took to do something.

Providing it all the relevant context is a skill, but the more it understands the problem you are trying to solve, the better it gets.

This is very different from GPT 5.6 Sol, which is exceptional at coding and other execution tasks where I can provide a lot of the input.