Open-source tax engine hits 96% on TaxCalcBench, topping Fable 5 and SOL
Intelligent_Prompt18 · reddit · 2026-07-24
An open-source tax engine hit 96% on TaxCalcBench, the highest score reported so far, beating Fable 5 and SOL when used with Claude Sonnet 5.
- The author says the engine is deterministic, so AI systems can use it for research and tax prep with less guesswork and fewer calculation mistakes.
- The only two misses were cases where the benchmark itself had inconsistencies, and the maintainers reportedly confirmed those issues.
- The post frames the project as a practical MCP-style tool that helps models handle structured calculations more reliably.
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