OpenAI uses Codex to build self-improving tax agents
OpenAI and Thrive Holdings just detailed Tax AI, an agent built with Codex that turns accountant corrections into structured evaluations to fix its own bugs. Piloted across Crete’s 30+ accounting firms on 7,000 tax returns, the system cut prep time by a third while its 75% accuracy rate jumped from 25% to 86% in six weeks. It shows how coding agents can autonomously maintain enterprise workflows in production.