Michael R. Bock @michaelrbock.com · Feb 20 1/ We just ran TaxCalcBench on Claude Sonnet 4.6. 37.25% of tax returns computed perfectly. That's a "mid-tier" model outscoring every single flagship model from 6 months ago. Updated leaderboard:
1 likes 1 replies
?
Replies
2/ What makes this interesting isn't the raw number: it's what it means for the cost curve. Sonnet 4.6 (cheaper, faster model): 37.25% Opus 4.5 (previous generation's most expensive model): 36.27% A model that costs a fraction of the price just beat last generation's at tax filing.