It's always a shock to me how opaque most other models are!
It also is pretty resilience to letting you inject in while it's working without going off course or while getting back on track after, which I appreciate
This is (unfortunately) by design. The proprietary models hide their reasoning traces so they can't be used for model distillation. Sometimes even when they do show reasoning, it isn't the model's real trace - IIRC, someone was able to demonstrate that Opus' reasoning is usually a summary made with Haiku behind the scenes.