Ah, yes, I'd forgotten about Gato. Thank you for reminding me. There's so much research activity that the Gato paper feels as if it was published eons ago. There's only so much I can retain in my puny little human mind at once!
In any case, I'm not sure Gato qualifies as a "large" model with 1.2B parameters -- it's kinda right below the threshold at which it could or would start exhibiting emergent behaviors. Maybe a new Gato with 10's or 100's of billions of parameters operating in the physical world?