The rapid development of artificial intelligence (AI) may lead to a new round of human capital substitution, among which the creativity of generative AI has been widely discussed. This article uses a double-blind experiment to recruit experts and consumers to evaluate the creativity of copywriting by AI and humans. The results show that experts could identify whether the copywriting was composed by AI or humans, while consumers could not. The creativity of AI in copywriting is equivalent to the experience of humans at 2.47 years, with a gap of 1.36 years to humans. Experts evaluated the professional ability of human copywriting significantly higher than that of AI, especially in creativity and insights. Consumers perceived no significant difference between the two types of copywrite. The conclusion of this article not only helps to clarify the level of creativity development of AI in the field of advertising but also has important management implications for optimizing talent training systems and creating new work modes of human-AI interaction.