A DevOps engineer just spent 48 hours running Gemma 4 4B on his laptop instead of GPT-4o. His coffee budget went up. His API bill went to zero.

The screenshots are everywhere this week. The math nobody is doing is more interesting.

Because if you're a vibe coder shipping AI features, "local LLM" is either the single biggest unlock of 2026 or a trap that costs you three months of velocity. Which one depends on numbers — your numbers — that most people never actually run.

Let's run them.

Why "$30/month feels cheap" is the trap