Despite Muse being relatively average, I've actually used the Meta AI webchat LLM since it released.
The reason: Its writing style feels "unique", and I find it pleasant to read for science-based topics.
I never ask _ONLY_ Meta AI, but the answer it gives is almost always in a distinctly different style than other frontier LLM's.
I think this is because of the unique JEPA architecture they have, but that's a layman's hunch.
I think it does not use JEPA.