Agreed on Opus 5.5 being a great model. It's the first one that I trust for long running (>1 hour) tasks.

It’s amazing at debugging too. I had it running in Powershell controlling an lldb session in MSYS2. The way it can read addresses and so root cause analysis is amazing! It takes a lot of mind power to do those things.

I like to watch it work though because it honestly teaches me some tricks.

I'm convinced gpt 4.5 was the best model humanity has ever made.

Now we are getting downgraded models that do 100x COT because it's cheaper.