gpt version, unreliable gpt output, parsing issues

[mwesterhof]

When trying to generate some things, I ran into several issues. engineer is currently targeting gpt model 4.0, which doesn't appear to be available. as mentioned in another issue, gpt-3.5-turbo seems to work. After making this change, i noticed that the parsing of the gpt response seemed to have some issues.

It's possible that these are related to me using a different model, but I can't test it with 4.0 as this doesn't seem to work at all. Engineer can't successfully parse the response to extract the correct filenames. I managed to update the regex to fit the output.

after making this change, i noticed that GPT has extremely inconsistent output, and will switch between several different formats, seemingly at random. The only fix i could think of for this was to add some format specifiers in the prompt, but that does seem to work.

this commit seems to solve the issues, but before making this a PR, some discussion is probably needed. Is this even the right way to go about fixing this?