[GistNoesis]

Only if tokens have value.

If codex is able to handle a generic api from reading the doc, it maybe could use a python library for solidity contracts like https://web3py.readthedocs.io/en/stable/contracts.html

As a contract user, I'd probably have more trust in a contract written by an independent AI from a short natural language specification which can't hide intent, than a contract with hidden backdoor, or a subtle bug.

Also the AI will probably improve with usage.

You probably can generate multiple version of your contract, and maybe a high level bug correction scheme like taking the median action between those version can increase bug robustness and find those edge cases when action differ.