Chinese 6-generation Fighter (SAC)

Shenyang Aircraft Cooperation (SAC) recently tested their next-generation fighter. The plane is a twin-engine fighter with lambda wings and moveable wing tips.
It is inferred that the plane took its maiden flight on December 22, 2024. Videos were posted, but they were considered as PS works because of bad quality. However, on December 26, videos of Chengdu's new fighter (looks like a flying triangle, possibly named J-36) went virus on the internet. Soon after that, a new video was posted, showing Shenyang's new jet (in black) taking off with a J-16 flying away. In early 2025, more videos were provided, showing another jet (in white) flying.
So far we can only confirm that the plane is smaller than Chengdu's design. Initially the plane was considered to have moveable stablizer, but recent videos seemed to deny the speculation.
This work is still rough due to lack of further information. Since the crew configuration is not determined yet, I put a black bay to serve as canopy, and it cannot be opened now. Slider 3 is used to control the wing tips (45 degrees).
Note: Given the cold weather in Shenyang, it is hard for citizens to take better photos. In the latest video, the plane seems to have a groove on the belly. However, that design will obviously have negative impact on stealth performance. Personally, I think the groove is a side effect of AI enhancement, since AI photography is common in Chinese smartphones now. Also, some people call the plane "J-50". Unlike CAC's jet, SAC's jet has no visible numbers on the craft, so I doubt that the fighter is named "J-50".