You seem to be asking for a device that is not readily available right now. You must choose between form factor and function in terms of importance. More precisely, if you value form factor above all else (as your opening query suggests), having a clearer idea of your intended purpose for the glasses will be crucial in helping you go through the many options. So, could you perhaps elaborate on what you hope to do with them?
In the interim, allow me to present your options:
Separate, incredibly light devices:
Vuzix Ultralite (for more information on those particulars, see my other response in this topic) - basic, tiny field of view monocular display; - lacks any sensors (camera, microphone, etc.)
Tales of Ray-Ban: No screen, but! This will be a very fascinating device (visual search everywhere you go) when they enable the usage of the on-device camera with voice interface to Meta AI (multimodal input - anticipated Q2 2024). Nice live-streaming feature as well. You won’t even be able to tell that you’re wearing “AR” glasses.
Lightweight 3DoF devices that are tethered in the “sunglass style”:
XReal Air, Air 2, and Air 2 Pro are some of the better choices. You can utilize a suitable mobile phone or the inexpensive Xreal Beam attachment to support Steam Deck, PCs, Macs, and other devices. You might have to wait a little while to get the remaining two gadgets outside of China; otherwise, you might stick with the original Air.
Rokid Max: Although Rokid’s product is similar to Xreal (also known as NReal), it may have less software support. Rokid has been a formidable competitor.
Middleweight, functional 6DoF devices:
Lenovo Think Reality A3 - connected to a smartphone (which needs to support Snapdragon Spaces). Much more highly functioning than any of the other mentioned devices, boasting an exceptional display. more expensive, heavier, and provides more. An expanding middleware standard called Qualcomm Snapdragon Spaces allows you to run a ton of awesome apps.
Many more gadgets in this category are expected to be released, most likely at CES 2024 in January. You may want to hold off on deciding if this is the kind of device you’re interested in until then if you’re not in a rush.