A way to change an AI's skills by directly changing its internal weights.
It is like changing wires inside a pinball machine. One tiny tweak may unlock a new trick. Or make the whole thing tilt.
Teams use it before release to shape a model's skills. A bad change can damage skills it already had.
Model Editing
Weight-Space Programming directly changes weights to alter skills or behavior.
Model merge
Model merge mixes weights from several models. This is one common way to work in weight space.
Fine-tuning
Both customize a model. Fine-tuning does it through more training.