a quick tip that may surprise some folks an uncached prompt to fable at 500k context window will directly cost you over $5 for A SINGLE REQUEST. that's a cup of coffee or a cheese burger gone. even with subscription quota, this hits like a truck the most common way to fall into that case is when you walk away from a long session and come back after a while when cache expired (claude is 1 hr, codex is 30 mins by default) in particular, when you come back to a long idle session, don't run "/compact" there thinking it'll reduce your cost, because the compaction request is still a real request and it will cost $5 by itself right there the best thing to do is to /compact BEFORE you walk away the next best thing is when you come back and see a large context window, just start a new session, and ask your agent to look for the last session's transcript if it needs context