The bug that cost $200

This week, a GitHub issue titled HERMES.md went viral on Hacker News: an Anthropic billing bug silently charged a developer $200 extra — and Anthropic initially refused a refund.

The thread now has 289 comments and 737 upvotes. Most of them are developers sharing their own billing anxiety stories.

Here's a sample of what people are saying:

"I disabled my Claude Code usage because I was terrified of runaway charges."

"Metered billing for AI tools is the new dark pattern."

"I now check my Anthropic dashboard more than I check my bank account."

This is not a bug story. This is a structural problem with how AI is billed.

The metered billing trap

Every major AI provider — OpenAI, Anthropic, Google Gemini — bills by the token.…