Manifest: Smart Model Routing for Agents — Cut Costs Up to 70%

GitHub·medium signal

Open-source model routing library (6.1K stars) that automatically routes agent subtasks to the cheapest model capable of handling them. Supports Anthropic, OpenAI, and custom providers with BYOK. Directly addresses the pattern of using Opus for complex reasoning while routing classification/formatting to cheaper models, reducing aggregate agent costs by up to 70%.