  In this paper, we introduce Concise Chain-of-Thought (CCoT) prompting. We
compared standard CoT and CCoT prompts to see how conciseness impacts response
length and correct-answer accuracy. We evaluated this using GPT-3.5 and GPT-4
with a multiple-choice question-and-answer (MCQA) benchmark. CCoT reduced
average response length by 48.70% for both GPT-3.5 and GPT-4 while having a
negligible impact on problem-solving performance. However, on math problems,
GPT-3.5 with CCoT incurs a performance penalty of 27.69%. Overall, CCoT leads
to an average per-token cost reduction of 22.67%. These results have practical
implications for AI systems engineers using LLMs to solve real-world problems
with CoT prompt-engineering techniques. In addition, these results provide more
general insight for AI researchers studying the emergent behavior of
step-by-step reasoning in LLMs.
