Yes it was great, but it also was stubbornly overtrained to go from prompt to solution on its own.

Since Opus 4.6 each following model has been increasingly worse at assisting me, and turned me into the assistant.

Maybe I'm struggling to cope with the vibe coding thing but it was so frustrating to ask it to investigate X (where X was easy to find by connecting dots in code) and see it working 10 minutes writing endless stuff in /tmp.

More than once I asked it similar investigation tasks and it proceeded to fix stuff (while not understanding properly the context of the business).

Was it brilliant? Yes. But it truly felt a major paradigm shift in human-llm interaction which I struggled with.

I'm increasingly certain they are too RLed to go from one prompt to solution, and that there are no meaningful tasks aimed at multi turn dialogue and user assistance.

It really felt like in a league of its own when it came to vibe coding, but light years away the usefulness of GPT 5.5 pro.