FilingLantern is a ChatGPT plugin paired with a companion website, designed to provide verifiable explanations of company financial results. The core problem it addresses is the lack of transparency and evidence behind convincing but unsubstantiated financial analyses. The workflow begins in ChatGPT, allowing users to ask about company figures, examine fiscal periods, and trace information back to SEC filing sources. Users can also identify where missing or incompatible inputs prevent calculations from being completed. To try it, users install the plugin in ChatGPT and ask specific financial analysis questions, followed by queries about supporting figures and filings. The companion website offers a demo for companies like FIX, supporting ten languages while retaining original SEC document languages. FilingLantern operates with three key boundaries: a closed calculation doesn't imply causation, missing inputs remain visible without invention, and automated checks differ from fully reviewed explanations. It serves as a research tool, not for live prices or investment advice, with a free public demo and a $9/month full research plan. The creator seeks feedback on how to present the boundary between retrieved facts, arithmetic, and interpretation in language model tools. Additionally, feedback is requested on the clarity of the path from a ChatGPT question to source checking within FilingLantern.