Exception handling in C++ is crucial to building robust and efficient AI models and financial systems. As we have seen, unhandled exceptions can disrupt program flow and cause unexpected behavior. This could have dire consequences in critical systems, such as those used in AI and finance.

Throughout this course, we have encountered both system-defined and custom exceptions. We have learned to use try, throw, and catch blocks in handling exceptions in our C++ code. The try block encloses the code which might throw an exception whereas the catch block catches and handles any exceptions thrown within the preceding try block.

Using meaningful exception messages is recommended for easily identifying the origin and cause of an error. However, exceptions should not be used as a method of flow control in your programs. Always remember to clean up resources after exceptions to avoid memory leaks.

The concept of RAII (Resource Allocation Is Initialization) further helps in managing resources neatly and avoiding potential memory leaks especially when dealing with exceptions.

In conclusion, adopting the best practices in exception handling, like not ignoring any exceptions, not using exceptions for flow control, and not throwing exceptions in destructors can immensely contribute to building reliable systems in the domains of AI and finance.

Mastering exception handling in C++ goes a long way in enhancing your coding skills, particularly in developing efficient AI models and financial systems.