Is it? Usually the professional tools are going to be incredibly more powerful and precise than the consumer grade stuff. That would be true here just as much as with previous iterations of sales. The opposing side has an information advantage and could expose their knowledge of true prices in the form of some RAG dataset, while the consumer grade LLM would just have to guesstimate. The information disadvantage doesn't disappear because it's machines doing the negotiating.
In addition, consider that one could train a professional-grade sales LLM against all the available "general purpose consumer" models with adversarial training techniques, so that it can "beat" them at price negotiation. Just as a quick sketch, you could probably do some form of prompt injection to figure out which model you are talking to and then choose the set of tokens most likely to lead to the outcomes you want.
Finally, the above paragraph assumes that such a sales LLM couldn't just buy certain responses from the consumer grade LLM provider btw, similar to how you can buy ad space from Meta and Google today.
