An LLM answers the same question differently every time, and everything you built on determinism will betray you. The problem becomes acute when your customer's safety, wellbeing, or earnings depend on what your application returns. How will your software keep its promise if it is nondeterministic and its output quality varies?
The answer is in traditional, algorithmic software. The hard truth is that AI systems cannot cope with the demands of production without thoroughly designed algorithmic support around them.
This talk shows how that is built in .NET. The model supplies judgment, your C# computes the outcome, and tests assert invariants instead of text.