What is the name of the new short range heat missile that has vast improvements over the AIM-9M?

The AIM-9X Missile represents a significant advancement over the AIM-9M in terms of technology and capabilities. It features enhanced guidance systems, including an imaging infrared seeker that provides improved target acquisition and tracking, especially in challenging environments. The AIM-9X also incorporates advanced maneuverability and improved fusing technology, which allows it to engage targets more effectively. This missile is designed to be more effective against modern and emerging aerial threats, reflecting substantial improvements in overall design and performance compared to its predecessors like the AIM-9M.

In contrast, the other options either refer to older missile designs or the same model, which do not offer the same advancements and features as the AIM-9X.