GPT-5.5 Costs Doubled Overnight: How to Build a Smart LLM Router That Saves 40-60% on AI API Bills

OpenAI's GPT-5.5 and Anthropic's Opus 4.7 API costs have doubled or significantly increased, impacting AI products. This article outlines a practical architecture for building a smart multi-model LLM routing layer, aiming to save 40-60% on AI API bills by balancing cost, latency, and quality.