Was spending a lot with cursor switching between sonnet and opus 4.1s like 1500 to $2k a month. Was doing a lot of tabs in parallel of course. Output was like 5k lines on Good day. (Lines not the best measurement) But a yard stick against feature testing and rework. Now with gpt-5-codex and codex vs code ext .. getting through up to 20k line changes in a day again lots of parallel jobs; but codex allows for less rewo…
If I was building a new project from scratch I'd probably use a CLI tool to manage a longer TODO easier. But working on existing legacy code I find an IDE integration is more flexible.