GridPath is a desktop application that connects Excel to Claude or OpenAI, letting an agent plan and execute multi-step spreadsheet tasks — pulling SEC filings, writing formulas, cleaning bulk rows, fetching live web data — without you approving each individual action. It is designed for finance professionals who already pay for Claude Pro or ChatGPT Plus and want those subscriptions doing real modeling work, not answering chat questions. The agent runs a tool loop autonomously, so a waterfall calculation that would take an afternoon of copy-paste work gets delegated. Where it breaks: complex branching logic across many interdependent sheets, and any workflow requiring data that lives behind an authenticated API. There is no self-hosted option, and no API for teams building internal tooling on top of it.