At work we are heavily encouraged to use LLMs, I have been giving them a try and always found the experience disappointing for tasks that require a bit of thinking / iteration... until last week. I tried Claude Opus 4 (MAX mode) on a task that would have given me a full day and it did it in ~10 min.
The task involved tweaking a custom build system after reasoning on a complex distribution problem. I really liked the solution it came out with (to be honest, I canceled the first try as soon as I saw some code and proposed a new approach).
This week I want to merge a huge set of patches on a new branch of an upstream project. I wrote the changes myself so I'm familiar with the code but it's always a PITA to merge them properly. I will see if Claude Opus can do it for me...