TaxCalcBench TY25 (web search)
Professional Work · 2026-06-22
TaxCalcBench TY25's 50 federal and state tax-return cases with web search enabled. Its headline strict score is the percentage of cases for which every evaluated line exactly matches the expected return; runs without external tools are scored under TaxCalcBench TY25.
Top models (higher is better)
| Model | Score |
|---|---|
| GPT-6 Sol | 66.0 |
| Claude Opus 5.5 | 64.0 |
| GPT-5.6 Sol | 64.0 |
| GPT-6.1 Sol | 64.0 |
| GPT-6 Astra | 62.0 |
| GPT-5.5 | 58.0 |
| Claude Fable 5.1 | 48.0 |
| Claude Opus 5 | 44.0 |
| Claude Sonnet 5.5 | 44.0 |
| Muse Wonder | 42.0 |
| Claude Fable 5 | 38.0 |
| Opus 4.8 | 32.0 |
| Kimi K3 | 32.0 |
| GPT-6 Luna | 30.0 |
| Muse Spark 1.3 | 26.0 |
| Gemini 3.7 Flash | 24.0 |
| Claude Haiku 5.5 | 20.0 |
| Gemini 3.6 Flash | 18.0 |
| Muse Spark 1.2 | 16.0 |
| Mistral Large 4 Preview | 4.0 |