Direct LLM substitution of core deliverable
#1The core economic deliverable of proofreading β a document corrected for errors of spelling, grammar, style, consistency, and formatting β is now produced by GPT-4o, Claude 3.5 Sonnet, Grammarly Enterprise, and Microsoft Copilot at accuracy rates that match or exceed experienced human proofreaders on standardized benchmarks, with processing times measured in seconds rather than hours and at zero marginal cost per additional document. The Anthropic Economic Index (January 2025) explicitly identifies text review and correction as among the highest-substitutability tasks for current LLMs. Academic studies including the 2024 MIT Media Lab benchmarking study found GPT-4o outperformed human proofreaders on standardized error-detection tasks at 1/100th the cost.