The article examines the phenomenon of "prompt injection" in the context of contemporary large language models (LLMs), elucidating a significant challenge for AI developers and researchers. The study comprises a theoretical and methodological review of scholarly publications, thereby enhancing the comprehension of the present state of research in this field. The authors present the findings of a case study, which employs a comparative analysis of the linguistic vulnerabilities of prominent LLMs, including Chat GPT 4.0, Claude 3.5, and Yandex GPT. The study employs experimental evaluation to assess the resilience of these models against a range of vector attacks, with the objective of determining the extent to which each model resists manipulative prompts designed to exploit their linguistic capabilities. A taxonomy of prompt injection attack types was developed based on the collected data, with classification according to effectiveness and targeting of specific LLMs. This classification facilitates comprehension of the nature of these vulnerabilities and provides a basis for future research in this field. Moreover, the article offers suggestions for bolstering the resilience of language models against negative manipulations, representing a significant stride towards the development of safer and more ethical AI systems. These recommendations are based on empirical data and aim to provide practical guidance for developers seeking to enhance the resilience of their models against potential threats. The research findings extend our understanding of linguistic vulnerabilities in LLMs, while also contributing to the development of more effective defence strategies. These have practical implications for the deployment of LLMs across various domains, including education, healthcare and customer service. The authors emphasise the necessity for continuous monitoring and improvement of language model security in an ever-evolving technological landscape.  The findings suggest the necessity for an ongoing dialogue among stakeholders to address issues pertaining to the prompt injection of funds.