This study investigates the impact of ChatGPT on academic writing, particularly in arXiv abstracts. Using a statistical analysis of word frequency changes in one million arXiv papers from May 2018 to January 2024, the research finds that ChatGPT has significantly influenced academic writing, especially in computer science. The fraction of ChatGPT-revised abstracts is estimated to be around 35% when using a simple prompt like "revise the following sentences." The study highlights both the positive and negative aspects of ChatGPT's influence on academic writing. While ChatGPT can enhance productivity and improve the quality of writing, it also raises concerns about the potential for misuse and the impact on academic integrity. The research also shows that ChatGPT has led to changes in word frequency, with some words becoming more common and others less so. The study concludes that ChatGPT is having a growing impact on academic writing, and further research is needed to fully understand its effects.This study investigates the impact of ChatGPT on academic writing, particularly in arXiv abstracts. Using a statistical analysis of word frequency changes in one million arXiv papers from May 2018 to January 2024, the research finds that ChatGPT has significantly influenced academic writing, especially in computer science. The fraction of ChatGPT-revised abstracts is estimated to be around 35% when using a simple prompt like "revise the following sentences." The study highlights both the positive and negative aspects of ChatGPT's influence on academic writing. While ChatGPT can enhance productivity and improve the quality of writing, it also raises concerns about the potential for misuse and the impact on academic integrity. The research also shows that ChatGPT has led to changes in word frequency, with some words becoming more common and others less so. The study concludes that ChatGPT is having a growing impact on academic writing, and further research is needed to fully understand its effects.