Interesting that they specifically nerf cyper-capabilities of open weight models:

"In preliminary experiments on internal models, we found that without data removal at either the mid-training or the RL stage, downstream cyber capability would increase substantially. These findings gave us a concrete lever for control. For the open-weight release of K3.1 Pro, we identified and removed cyber-related data from both training stages, while retaining the general-purpose coding tasks needed for model usefulness."

Maybe it's intentional so government doesn't block open weight release.

There was law proposal (rumour?) last week about Chinese labs having to get approved for weights release now.