ChatGPT loses track of our 40 page brand guide halfway through

the cheat sheet works. also, part of what you're seeing is just long chats. after a lot of back and forth the early instructions get less weight, so it drifts no matter how good the guide is. new chat for each piece of work fixed most of it for us. another trick: ask it to list the three or four rules that apply before it writes anything. if it gets those wrong you catch it before you have a full draft to fix.

40 pages is mostly stuff the model doesn't need for any one task. we cut ours down to a 2 page cheat sheet: voice in a few lines, words we use and never use, formatting rules, three example paragraphs. put that in a project's instructions or a custom gpt so it's there every chat, and keep the full guide as a file it can look things up in. way more consistent than pasting the whole thing in.