> API is at least 10 times more expensive (own experience),

More. On CC I'm currently burning ~$5k a day (according to claudes own metrics) and I use up the weekly quota in about 3-4 days. Meaning I'm eating $20k worth of tokens for a $200 sub.

Current session I have running in the background, spinning up tests mostly

Total cost: $660.33

  Total duration (API):  22h 36m 33s


  Total duration (wall): 8h 33m 58s


  Total code changes:    7662 lines added, 177 lines removed


  Usage by model:
      claude-haiku-4-5:  6.0k input, 38 output, 0 cache read, 0 cache write ($0.0062)


         claude-opus-5:  322.9k input, 5.1m output, 702.9m cache read, 19.3m cache write ($606.64)


       claude-opus-4-8:  742 input, 883.5k output, 38.6m cache read, 2.0m cache write ($53.68)

What are you doing with this, if I may ask?