I encounter this all the time with GenAI projects. The idea of stability and "frozen" just doesn't exist with hosted models IMO. You can't bet that the model you're using will have the exact behavior a year from now, hell maybe not even 3 months. The model providers seem to be constantly tweaking things behind the scenes, or sunsetting old models very rapidly. Its a constant struggle of re-evaluating the results and tweaking prompts to stay on the treadmill.

Good for consultants, maybe, horrible for businesses that want to mark things as "done" and move them to limited maintenance/care and feeding teams. You're going to be dedicating senior folks to the project indefinitely.

I interpreted the comment as worrying about drift across many contracts not one contract changing.

Imagine I create a new agreement with a customer once a week. I’m no lawyer so might not notice the impact of small wording changes on the meaning or interpretation of each sequential contract.

Can I try and prompt engineer this out? Yeah sure. Do I as a non lawyer know I have fixed it - not to a high level of confidence.

No, at least not in all cases. Customers incur review costs and potentially new risks if you change contract terms unexpectedly. In my business many large customers will only adopt our ToS if we commit to it as a contract that does not change except by mutual agreement. This is pretty standard behavior.