Semantic ablation is the algorithmic erosion of high-entropy information. Technically, it is not a “bug” but a structural byproduct of greedy decoding and RLHF (reinforcement learning from human feedback).
During “refinement,” the model gravitates toward the center of the Gaussian distribution, discarding “tail” data – the rare, precise, and complex tokens – to maximize statistical probability. Developers have exacerbated this through aggressive “safety” and “helpfulness” tuning, which deliberately penalizes unconventional linguistic friction. It is a silent, unauthorized amputation of intent, where the pursuit of low-perplexity output results in the total destruction of unique signal.
“No wonder politicians are so enamoured by AI…” -> Anonymous Coward in the comments of this article



If they wanted, they could just turn a knob to have it spit out “tail data” more often.
It’s not that simple.
Sure it is you uh…hold on let me sample the tail distribution for an insult…you snollygoster!
Who you calling a snollygoster, you wangdoodle?!
It’s called XTC (exclude top choice) and is implented in a bunch of sorters. It’s also used to jailbreak a bunch of models.
Edit: https://github.com/oobabooga/text-generation-webui/pull/6335
It would probably make more mistakes.