Which of the following is NOT a prompt engineering technique?

In the context of prompt engineering techniques, the focus is on methods used to improve the interaction between users and AI models by optimizing the input prompts provided to these models.

ReAct, CoT (Chain of Thought), and Metaprompting are all recognized techniques within the field. ReAct refers to a method that enhances the AI's ability to generate responses in a conversational context by focusing on the reasoning steps it should take. Chain of Thought encourages the model to break down its reasoning process into a sequence that makes it easier to follow and understand, promoting clearer and more rational answers. Metaprompting involves creating prompts that guide the generation of other prompts, helping to structure complex information more effectively.

Revising, while it may play a role in refining inputs, is not considered a formal prompt engineering technique. Instead, it is often viewed as a part of the iterative process of improving prompts rather than a distinct method or strategy in the realm of prompt engineering. Therefore, its classification as opposed to the other defined techniques is what makes it the correct choice in this question.