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What is in-context learning, and why does chain-of-thought prompting improve results?

In-context learning is the property that turned prompting into a paradigm; chain-of-thought is its most useful trick. What matters is knowing what 'learning' means here (no weight updates) and why making the model reason step by step actually helps. Here is the answer.

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

In-context learning is the property that turned prompting into a paradigm; chain-of-thought is its most useful trick. What matters is knowing what 'learning' means here (no weight updates) and why making the model reason step by step actually helps. Here is the answer.

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