Apple first unveiled the Apple Watch Series 8 and the second-generation Apple Watch SE, according to the Apple Watch comparison page, both models supported Bluetooth 5.0, but Apple now claims they support the newer Bluetooth 5.3 standard.
MacRumors was able to confirm that both models support Bluetooth 5.3 in some locations.
According to Apple, all four iPhone 14 models, the second-generation AirPods Pro, and the Apple Watch Ultra, support Bluetooth 5.3.
Bluetooth 5.3 is said to include the LE Audio specification. However, there is no evidence that Apple has yet included LE Audio in its latest products.