Anyone building serious AI systems knows this pain — same prompt, same model, different result.
Sometimes it’s formatting drift, sometimes it’s reasoning quality suddenly dropping for no clear reason.
So here’s the question for experienced builders:
How do you stabilize LLM performance across runs and updates?
Do you rely on prompt enclosures, structured parsers, few-shot consistency prompts, or custom model fine-tuning?
And how often do you re-validate outputs after OpenAI or Anthropic silently tweak model behavior?
Let’s compare methods that actually work — not theory, but real practices for keeping agent workflows stable.