The study explores the potential of using ChatGPT in facilitating differentiated instruction, focusing on its ability to assess Chinese learners' language abilities, produce materials in different genres and at different levels, create teaching tasks, and simulate assessments. The correlation was calculated between the original scores and ChatGPT-generated scores of forty-five randomly selected HSK test writing samples. Additionally, ChatGPT's ability to generate diverse materials was tested by simulating thirty texts across various genres and levels. The study also examined ChatGPT's capability in creating a range of tasks and assessments.The result showed a significant correlation between the original scores and those generated by ChatGPT, indicating its ability as a useful tool to measure learners' language performance. ChatGPT demonstrated efficacy in generating materials spanning different genres and difficulty levels, aligned with the CEFR benchmarks. Given specific and well-structured prompts, ChatGPT proved adept in tailoring tasks and assessments. Further research is crucial to understand the application of ChatGPT in differentiated instruction.