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What is Chain of Thought?

Definition

Chain of Thought

Chain of Thought (CoT) prompting is a technique that instructs Large Language Models to write down their step-by-step reasoning process before outputting the final answer. This improves performance on complex reasoning, math, and logic tasks.

Why It Matters for AI Builders

Helps AI builders design and scale robust architectures; mastering the implementation of Chain of Thought improves latency, accuracy, and operational efficiency for reasoning optimization, complex math solving, and software engineering prompts.

Detailed Deep Dive

Chain-of-Thought (CoT) prompting is an in-context learning technique that encourages Large Language Models to generate intermediate reasoning steps before arriving at a final answer. By explicitly structuring the output to "think step-by-step," the model decomposes complex arithmetic, logical, and multi-step reasoning problems into manageable components. This reasoning phase significantly improves accuracy and provides an auditable explanation of the AI's logic.

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Frequently Asked Questions

Q:Why does Chain of Thought work?

Because LLMs generate text token-by-token. Giving them "thinking tokens" allows them to compute intermediate steps before finalizing their output, reducing errors.

Q:What is zero-shot Chain of Thought?

Simply adding the phrase "Let's think step by step" to the prompt, which triggers reasoning behaviors in the model.

Quick Facts

  • CategoryPrompt Engineering
  • Key ApplicationReasoning optimization, complex math solving, and software engineering prompts

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Cite This Term

Chain of Thought Media Coverage & Intelligence

PRODUCT LAUNCHJul 23, 2026

LISA: Linear-Indexed Sparse Attention for Efficient Long-Context Reasoning

Recent advances in long chain-of-thought reasoning model such as DeepSeek-R1 have led to increasingly longer inference context lengths under the test-time.