We better not talking about what defines a sixth gen fighters... LOL
If we take the words from Yang Wei, who is the chief designer of J-20 and the boss of Chengdu's sixth gen fighter program, then accroding to an interview in 2023, Yang's definition of Sixth gen fighter including:
Can taking off and landing at airports like ordinary aircraft, and conducting high attitude or even sub-orbital operations;
Transform based on flight altitudes, cross-atmospheric combat;
Equipped with smart skin/surface, allowing the airframe to repair itself automatically;
It will be powered by a new generation engine for vastly expanded flight altitudes/machs missions;
Data-fusion and far far better info tech/AI comparing to 5th gen fighters.
Equiped with new mechanism radar, laser self-defence weapons, microwave weapons.
baijiahao.baidu.com
baijiahao.baidu.com
I suspect Chengdu's 6th gen fighter we saw, is like the commanding mothership, thus it is huge, has vast range, and aiming at high stealth, and may even flight at much higher alititutde so few can touch them, Chengdu's design may tend to leave the close combat/dogfights to unmanned wingmens.