I suspect AI text detection has actually become easier, as chatbots today have been heavily finetuned towards a more distinctive style.
For example “delve” and the em-dash are both a result of the finetuning dataset, not the base LLM.
For example “delve” and the em-dash are both a result of the finetuning dataset, not the base LLM.
The principle of training them is quite simple. Take an LLM and reward it for revising text so that it doesn't get detected. Reinforcement learning takes care of the rest for you.