OpenAI partnered with Thrive Holdings to develop Tax AI, a self-improving system that automates complex tax filings for Crete's network of 30+ accounting firms. The system addresses significant bottlenecks in tax preparation where data entry alone can take eight hours per return.

Tax AI saves practitioners about a third of their preparation time while achieving 97% accuracy and increasing throughput by 50%. The system demonstrates measurable self-improvement, with returns reaching 75% correct field completion jumping from 25% to 86% within just six weeks.

The self-improvement capability stems from a three-part methodology: practitioner feedback, production traces capturing full workflow paths, and a Codex-driven iteration loop. This approach transforms manual corrections into structured findings that fuel autonomous improvement, enabling the system to handle increasingly complex tax documents over time.