I built an open-source AI spreadsheet that doesn't hallucinate math

If you've ever tried using an LLM to build a financial model or a complex spreadsheet, you know the pain: they almost always hallucinate the math, create circular references, or silently break formulas. LLMs are incredible at reasoning and structuring data, but they shouldn't be trusted with strict arithmetic. I wanted a workflow I could actually trust, so I built GridOS and open-sourced the core engine. The Architecture: Separating Reasoning from Math GridOS acts as a deterministic spreadsheet kernel.