The J-20 was developed as a foil to advanced U.S. fighters, including fourth generation F-16 Fighting Falcons and F/A-18 Hornets and, more directly, fifth-generation F-22 Raptors and F-35 Lightning fighters.

In 2009, a breach of F-35 project resulted in the theft of several terabytes of data. Though the attack was never publicly attributed to China by the U.S. government, visual similarities in the chassis of the J-20 to the F-35 have led commentators to speculate that the stolen F-35 intellectual property helped state-owned Chengdu Aerospace Corporation develop their fighter.
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