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 rework.
The job of the "engineer" has changed a lot. At 5k lines I was not reviewing every detail but it was possible to skim over what had changed. At 20k it's more looking at logs performance / arch & observation of features less code is reviewed.
Maybe soon just looking at outcomes. Things are moving quickly.
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 rework.
The job of the "engineer" has changed a lot. At 5k lines I was not reviewing every detail but it was possible to skim over what had changed. At 20k it's more looking at logs performance / arch & observation of features less code is reviewed.
Maybe soon just looking at outcomes. Things are moving quickly.