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← LLM & GenAI Fundamentals / 27
hardOpenAIAnthropicMicrosoft

A customer says 'the model got worse, and we changed nothing.' What are your hypotheses, and how do you test each?

The classic FDE escalation. Six hypotheses, silent model updates, input drift, prompt entropy, sampling noise, perception shift, and the eval-replay test that splits them in an afternoon.

Updated Aug 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.

The classic FDE escalation. Six hypotheses, silent model updates, input drift, prompt entropy, sampling noise, perception shift, and the eval-replay test that splits them in an afternoon.

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