"My AI Coding Tools Were Running Up a Tab I Couldn't See — So I Fixed That"

Three months ago I had four AI coding tools set up: Claude Code, Codex CLI, Gemini CLI, and a chat UI for quick questions. Every month I'd get a bill from Anthropic and a bill from OpenAI and vaguely wonder what I'd actually spent them on. I had no idea which model was being called when. I didn't know if Claude Code was routing to Sonnet or Opus. I didn't know how many tokens Gemini was burning in the background. I just paid the bill and moved on. Then I looked at one month's invoice line by l...