There's not any "best" code language to write Artificial Intelligence (AI) programs. The language chosen will need to develop AI systems and algorithmic structures that are able to analyze data and change to learn from what it has learned. The most appropriate choice will depend on the kind of project as well as the task it will need to achieve. The ultimate usage of the program includes how fast it will be and the additional programs and platforms it'll need to integrate with can help to determine the best language to use. The most commonly used languages in AI programming comprise Python, C++, R Language, JavaScript, Prolog, Artificial Intelligence Markup Language (AIML), MATLAB, Haskell, LISP and Julia among others.