OpenAI and Thrive Holdings Launch Self-Improving Tax AI That Cuts Prep Time by a Third and Hits 97% Accuracy

OpenAI and Thrive Holdings have deployed a self-improving Tax AI that automates 1040 and 1041 tax return preparation, cutting document prep time by a third and achieving 97% accuracy through a three-part feedback loop that drove correct field completion from 25% to 90% of returns.

• OpenAI and Thrive Holdings have deployed Tax AI, a self-improving agent that automates 1040 and 1041 tax return preparation, cutting document prep time by a third while achieving up to 97% accuracy.
• The system uses a three-part feedback loop — practitioner error correction, conversion of corrections into evaluations, and a Codex-driven improvement cycle — driving accuracy from 25% of returns meeting the 75% completion threshold at launch to 90% of returns hitting 100% correct field completion.
• Built on OpenAI's open-source Codex harness, the self-improving design is already being extended to accounting, audit, and operational workflows, with developers invited to use it as a blueprint for building similar agents across industries.