I have been using the $200 plan the past day in CodexCli and so far find that it is easy to work with (nothing crazy, just web app stuff). The context window means I no longer have to worry about running out of room and it seems to stay on track just fine so far. I have it incrementally coding pieces in a manageable chunk to understand and verify. No limits so far as promised. In contrast, using Claude Code ($100 level) I run into limits after just a couple of iterations of asking and context window gets problematic too quite quickly. It feels like 5 isn't gobbling up as much irrelevant text as Claude does.