Claude Code Is Burning Your API Budget: The Model Routing Architecture That Fixes It

Claude Code Is Burning Your API Budget: The Model Routing Architecture That Fixes It Published: 2026-04-10 | Author: ~K¹ / IntuiTek¹ Most Claude Code agents default to Claude Sonnet for everything. Every task — whether it's classifying a one-sentence input or synthesizing a 50-page analysis — hits the same frontier model at the same price. That's expensive. And unnecessary. Most agent work doesn't require frontier reasoning. This is the model routing architecture I've been running on a production autonomous agent for several weeks. It cuts API spend to near-zero for a large class of tasks while keeping quality exactly where it needs to be. The Problem: One Model For Everything When you let an agent run autonomously, it executes many tasks you never directly observe. Inbox polling. Classification. Summarization. Routing decisions. Content extraction. Cache lookups. None of those require Claude Sonnet. But if your agent is calling the Anthropic API for all of them, you're paying Sonnet p