To determine which of the given options is not an AI language, we need to understand the context and features of each option mentioned.

1. LISP: This is one of the oldest programming languages and has been extensively used in AI research. It's known for its excellent support for symbolic reasoning and rapid prototyping which makes it a popular choice for AI applications.
2. PROLOG: This language is rooted in formal logic and is used primarily for solving problems involving objects and relationships between them. It's widely utilized in AI, especially in the areas of natural language processing and symbolic reasoning.
3. OOP: OOP stands for Object-Oriented Programming, a paradigm based on the concept of "objects", which can contain data and code to manipulate that data. OOP is not a programming language; instead, it is a programming paradigm that can be implemented using various languages such as Java, C++, and Python.
4. VBI: There seems to be a typographical error or an uncommon reference here, but it is clear that it is not traditionally recognized as a mainstream AI language, unlike LISP or PROLOG.

Analyzing the options, OOP is not a programming language itself but rather a programming paradigm. Therefore, it is the correct answer to the question.

Conclusion: The option that is not an AI language from the given list is OOP.