What is j13 fighter?

As an AI language model, I don't have access to the latest classified military information, but I can provide some public information about the J-13 fighter:

There is no official information about the J-13 fighter as it is believed to be a hypothetical future concept. It is speculated in some reports that the J-13 could be a fifth-generation fighter jet that would be developed by the People's Liberation Army Air Force (PLAAF) of China in the coming years.

According to some sources, the J-13 could be designed as a stealth fighter, equipped with advanced sensors, avionics, and weapons systems. It is expected that the J-13 will have a longer-range, greater maneuverability, and better stealth capabilities than its predecessors.

Some sources also suggest that the J-13's primary mission could be air superiority and that it could be an important part of China's regional military strategy, given the ongoing territorial disputes in the South China Sea.

However, it is important to note that the information available on the J-13 fighter is speculative, and the actual design and capabilities of the fighter may vary significantly from these assumptions.