I tracked every Claude Code call for 30 days. Here's the cost breakdown that justified switching to Gemma.

A month ago I switched my Claude Code setup so that the terminal calls go through a local Ollama model instead of hitting Anthropic. The claim I made publicly at the time was that this cuts Claude Code spending by roughly 90%. A few people in the comments asked, very fairly, "where does that number come from?" So I started tracking. Every Claude Code session for the next 30 days got logged: what kind of task it was, which engine handled it, how long it took, and — for the Anthropic-side calls —