I think you're underestimating the "more expensive". It's not a 30% discount or similar. API is at least 10 times more expensive (own experience), ~40x as expensive if [1] is accurate.
At that price difference, lots of things that are viable to do in whatever harness the subscription allows are simply impractical via API, you'd be spending a whole developer's salary just for the benefit of using a different harness.
I tried for example Deepseek V4 Pro for a bit (via API pricing), but it's _more expensive_ than Sol via subscription, even though $1.7/Mtok is a lot less than 20$/Mtok.
> 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
> At that price difference, lots of things that are viable to do in whatever harness the subscription allows are simply impractical via API, you'd be spending a whole developer's salary just for the benefit of using a different harness.
Could you elaborate on that?
Off topic:
You did the ISBN visualization thing! Awesome!
API costs are simply too high. If you go wild you can easily burn $3-5k a day. If you really hammer it (ie going full parallel agentic) you can exceed $10-20k. And this isn't even going crazy. Those costs are simply too high to make any sense.
There's your answer