I have always used Claude at max thinking levels since it launched. It has never been up to the task. For clarity, the task being this: https://github.com/tsoniclang/tsonic
Meanwhile, there are half a dozen other projects (business apps, web apps etc) where it works well.
This is because no one bothers to set thinking to high, as it now defaults to medium in CC.
Once you set thinking to high it works just as well as 5.4 even for pretty complex tasks
I have always used Claude at max thinking levels since it launched. It has never been up to the task. For clarity, the task being this: https://github.com/tsoniclang/tsonic
Meanwhile, there are half a dozen other projects (business apps, web apps etc) where it works well.