API Usage Graph Question

I have a question. I’d like to know what the usage information in the image means.
It used to be intuitive because there was only one API, but it seems to have changed with Composer 1.5. I’d like to know what it means.

With Composer 1.5, usage is now split into two buckets:

  • Auto + Composer

  • API

The 15% “Total” is not a third independent bucket — it’s a weighted combination of those two usage types against your plan’s included allowances.

So in your screenshot:

  • Auto + Composer: 4%
    → Usage from Auto Mode / Composer / Agent-driven IDE actions

  • API: 37%
    → Usage from non-Auto model calls and anything that bills against your API quota
    (Ultra includes at least $400 of API usage)

  • Total: 15%
    → A normalized calculation of how much of your combined included plan usage you’ve consumed across both buckets

Because Auto/Composer usage and API usage draw from different included allowances, the Total reflects their weighted impact on your overall plan — not a simple average or sum.

Also note:

Once your included Auto + Composer allocation is exceeded, additional usage may begin drawing from your API quota.

With regards to the included allowances, is API usage allowance consumed when using models for which we have an API Key?