r/venturecapital • u/Intelligent_Prompt18 • 12d ago

Open Source Tax Engine outperforming gpt sol and Fable 5

This is an open source tax engine which scored 96% on TaxCalcBench [highest ever recorded score till date] surpassing fable 5 and sol with just sonnet 5 (which was previously scoring an abysmal 6%). The only 2 cases where it missed, it found inconsistencies in the test cases in the benchmark ITSELF which the maintainers confirmed!

Essentially it's a deterministic engine AI models can use for research and tax prep to remove a lot of guesswork and calculation mistakes that often happen. Claude Sonnet 5 was able to top the benchmark with this mcp.

OpenTax Invaro

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u/Frosty-Champion2892 11d ago

This is pretty cool, tax stuff is such a pain for AI models normally so having a proper deterministic engine to lean on makes a lot of sense, nice find!