What are logits and log-probs, and how do you actually use them in production?

Definitions take thirty seconds. The interview is about the four things log-probs buy you in production: a confidence signal, banning tokens, guaranteeing valid output, and classification you can calibrate. Plus the tokenization gotcha that quietly breaks all of them.

Updated Sep 2026 · Grounded in real GenAI, LLM, and AI/ML engineering interview loops and written to a senior-engineer editorial bar.