Filed scored 94% line-by-line accuracy on TaxCalcBench, an independent benchmark for AI tax preparation. ChatGPT scored 42%, Claude scored 35%, and Gemini scored 23% on the same benchmark. The difference is architecture: general-purpose chatbots answer tax questions using training data. Filed reads the actual source documents and cross-references them against the prepared return. Filed is purpose-built for tax, not a chatbot wrapper.