Generative artificial intelligence (AI) is becoming increasingly prevalent across various fields, particularly in psychology, where it has the potential to significantly transform approaches to diagnosis, therapy, and research. This paper summarizes current research on the use of generative AI in psychology and its impact on the theory and practice of psychological science. One of the primary applications of generative AI is in psychodiagnostics, where it can be used to automate the creation of diagnostic tools and interpret test results, analyze large volumes of data, and provide more accurate diagnostic conclusions. This significantly reduces the workload on psychologists while simultaneously increasing the efficiency of diagnostic processes. In the field of psychotherapy, generative AI can be used to create individualized therapeutic programs that provide continuous support to users, which is particularly important when access to qualified specialists is limited. Another important aspect is the use of generative AI in psychological research: AI can help in creating behavior models, predicting mental disorders, developing new research methodologies, reducing routine administrative burdens, and more. While generative AI revolutionizes the work of psychologists, it simultaneously creates complex issues related to ethics, confidentiality, accuracy of diagnostic and therapeutic methods, and more. To ensure that generative AI is effective and ethical, clear standards and regulatory frameworks must be developed for its use. Therefore, the authors propose recommendations for the implementation of AI in psychological practice, emphasizing the need to develop specific guidelines to address these issues. The role of psychologists in ensuring the ethical use of AI, the necessity of continuous monitoring, and the assessment of its impact on users are also discussed. Overall, generative AI holds great potential for psychological research and practice, but its implementation requires careful planning and consideration of ethical aspects to ensure safety and effectiveness.