The Hidden Bill - What It Actually Costs to Use Your Coding Agent as Your Testing Agent
A CTO told me last month, very pleased with himself:
"We're already paying $200/month per dev for Claude. Testing is basically free now — we just ask Claude to also write the tests."
I asked him to pull up his Anthropic bill. The number was 14x what he'd budgeted at the start of the quarter. And his team still hadn't shipped the regression suite.
This is the most expensive trap in the AI tooling stack right now, and it's expensive precisely because it looks free. If you've already bought a coding agent, asking it to do double duty as a testing agent feels like the obvious move. One subscription, one workflow, one bill.
Except there is no "one bill." There are six.

