The latest articles on DEV Community by Filip Majchrzak (@filip_majchrzak_dbffebe9f). https://dev.to/filip_majchrzak_dbffebe9f https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F4203184%2F75f0c95e-33b5-4341-b811-5c2c3b15d6af.jpg https://dev.to/filip_majchrzak_dbffebe9f en Filip Majchrzak Fri, 23 Oct 2026 17:53:02 +0000 https://dev.to/filip_majchrzak_dbffebe9f/filinglantern-a-chatgpt-plugin-for-checking-company-results-against-sec-filings-bki https://dev.to/filip_majchrzak_dbffebe9f/filinglantern-a-chatgpt-plugin-for-checking-company-results-against-sec-filings-bki <p>I'm Filip, the creator of <strong>FilingLantern</strong>. It is primarily a <strong>plugin for ChatGPT</strong>, with a companion website for inspecting the figures, calculations and source documents.</p> <h2> The problem I wanted to solve </h2> <p>A fluent explanation of a company's results can sound convincing while leaving an important question unanswered: can I check the evidence behind it?</p> <p>FilingLantern's workflow starts in ChatGPT. You can ask follow-up questions about reported company figures, examine matching fiscal periods, follow SEC filing sources and see where missing or incompatible inputs prevent a calculation from closing.</p> <h2> Try it in ChatGPT </h2> <ol> <li> <a href="https://chatgpt.com/plugins/plugin_asdk_app_6ac21712c7748191995d526144057af7" rel="noopener noreferrer">Open the FilingLantern installation page</a>.</li> <li>Connect FilingLantern using the controls shown in ChatGPT.</li> <li>Start with a concrete question, for example:</li> </ol> <blockquote> <p>Analyze FIX's 2024 and 2025 annual results. Show the evidence card, explain the calculations, then challenge the explanation.</p> </blockquote> <p>Then ask: Which reported figures support this comparison? What remains missing? Which filing supports that claim?</p> <p><a href="https://signal-gap-free.fmajchrzak.chatgpt.site/?ticker=FIX&amp;period=annual" rel="noopener noreferrer">Explore the companion website demo for FIX</a>. The website interface supports 10 languages, selectable from its language menu; original SEC documents remain in their source language.</p> <h2> Three boundaries that matter </h2> <ul> <li> <strong>A closed calculation is not a causal explanation.</strong> Reconciling operating income, nonoperating totals and tax to net income does not establish why the business changed.</li> <li> <strong>Missing inputs stay visible.</strong> An unresolved gap should not become a plausible story or an invented number.</li> <li> <strong>Automated checks and reviewed explanations are different.</strong> Full reviewed Evidence &amp; Challenge cases currently cover FIX and CME only.</li> </ul> <p>This is a research tool, not live prices, forecasts or buy/sell recommendations. The public website demo is free; the full website research plan is $9 per month.</p> <h2> Feedback I'd find useful </h2> <p>For anyone building tools around language models: how would you present the boundary between retrieved facts, arithmetic and interpretation?</p> <p>For anyone trying FilingLantern: is the path from a question in ChatGPT to checking the source clear, or is there an onboarding step you would change?</p> <p><em>Disclosure: I'm the maker of FilingLantern. This post was drafted with AI assistance.</em></p> showdev