Today I asked it to make a short bit of code to query some info from an API. I needed it to not use the specific function X that is normally used. I added to its instructions "Never use function X" then asked it in the chat to confirm its rules. It then generated code using function X and a word soup explaining how it did not uses function X. Then I copy pasted the line and asked why it used function X and it said more word soup explaining how the function was not there. So yea not so good.