Open-source tax engine hits 96% on TaxCalcBench and tops Fable 5 and Sol
Intelligent_Prompt18 · reddit · 2026-07-24
Open-source tax engine claims a 96% TaxCalcBench score
The poster says an open-source tax engine reached 96% on TaxCalcBench, which they describe as the highest score recorded so far, and beat Fable 5 and Sol using only Claude Sonnet 5.
What the post claims
- The engine is deterministic, intended for tax prep and research.
- It is meant to reduce the guesswork and calculation mistakes that LLMs often make.
- The two misses on the benchmark were reportedly due to inconsistencies in the benchmark itself, which the maintainers confirmed.
Why it matters
- The author suggests models can use this engine as a tool rather than relying on pure generation for tax reasoning.
- They also note that Claude Sonnet 5 topped the benchmark when paired with this MCP setup.
Related event: Open-source deterministic tax engine scores 96% on TaxCalcBench(5 posts)→
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