Really well. Temp turned down all the way, and Gemini has this new feature to run and execute code.... Not function calling... It can write a small python script, run it and return the output.

So our prompt explains the excel spreadsheet, then tell it exactly the format we need it in, and then tell it to use python and pandas to read in the CSV, clean it up and reshape it the way we need it to match what we expect and voila.

So hallucinations are not really and issue with the data as it's simply writing code which then deterministically processes and returns the data.

Edit to add more info: basically Gemini can create and run a lambda function on the fly. And if you're a coder you can really guide the prompt. Eg "load this into pandas. Then remove all the empty columns. Also remove the total rows. Now unpivot the data so the months are not columns but in separate rows with a column called month.

You get the idea.

The second one. It is always the second one.