Is a model's chain-of-thought faithful to its actual reasoning, and why does it matter?
Chain-of-thought looks like the model showing its work, but it may not mirror the real computation. The signal is knowing CoT can be a post-hoc story, with evidence, and what that breaks for safety and oversight.
Updated Sep 2026 · Grounded in real GenAI, LLM, and AI/ML engineering interview loops and written to a senior-engineer editorial bar.
Chain-of-thought looks like the model showing its work, but it may not mirror the real computation. The signal is knowing CoT can be a post-hoc story, with evidence, and what that breaks for safety and oversight.
Lead with where the obvious approach breaks, because that is the judgment they are screening for — most candidates jump straight to the happy path and lose the room.
Then walk the failure back through the pipeline in order, naming the one metric the customer's exec sponsor actually cares about before you propose the fix.
