Michael R. Bock @michaelrbock.com · Feb 18 1/ One year ago, no AI model could calculate a single tax return correctly. Today, Claude Opus 4.6 gets 52.94% right. Here's the full timeline of how AI went from 0% to halfway to replacing TurboTax:
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2/ July 2025: We released TaxCalcBench. The best model (Gemini 2.5 Pro) scored 32.35% Sep 2025: GPT-5 launched with a TCB Score of: 38.24% (better!) Jan 2026: GPT-5.2 Pro hit 41.18% Feb 2026: Claude Opus 4.6 jumped to 52.94% ! That's a ~20 point improvement in 7 months