Results seem somewhat reasonable given that the amount of verus/TLA/Creusot/Lean code out there is tiny compared to all the other non-formal code.

So it's understandable that the agents wont be able to go beyond proving trival things, given how much more difficult it is to write such code.

A (more) interesting experiment (to me) would be to write a high level spec manually for a non-trivial system (liveness etc.) and see if the agent can produce an implementation using guided refinements that satisfies this specification.