Source code, install instructions, and full documentation: github.com/khabbazan/ocr-captcha-router

A lightweight shared-style captcha router that downloads the selected TrOCR expert on first use. Hugging Face caches downloaded experts locally, and the resolver uses a confidence and grammar-based dual-model fallback for uncertain routes.

Keep the captcha at its original aspect ratio. The resolver pads only the router input and leaves OCR preprocessing to each TrOCR processor. The first request for each route downloads that expert; later requests reuse the in-memory model and Hugging Face cache. math_confidence_threshold accepts a value from 0.0 to 1.0; it is the minimum router probability required to choose the math result when both expert outputs match their valid formats.