Check your model thinking effort.

You have to go into /models then use the left/right arrow keys to change it. It’s a horrible UI design and I had no idea mine was set to high. You can only tell by the dim text at the bottom and the 3 potentially highlighted bars.

On high It would think for 30+ minutes, make a plan, then when I started the plan it would either compact and reread all my files, or start fresh and read my files, then compact after 2-3 changes and reread the files.

High reasoning is unusable with Opus 4.6 in my opinion. They need at least 1M context for this to work.