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Generating running routes with GPT-6 Astra and ChatGPT Work Simon Willison’s Weblog Subscribe Generating running routes with GPT-6 Astra and ChatGPT Work 12th September 2026 Here’s a neat thing I had ChatGPT Work with GPT-6 Astra (Max) do this morning: I live at . Figure out 5K and 10K running routes from me that loop from my house. Use OSM data. It worked for 27 minutes and produced exactly what I’d asked for, as both an embedded visualization and downloadable GPX file and GeoJSON files. Here’s that 5K route: When I asked it how it had created the route, it replied: I used Nominatim to locate the address and Overpass to download local OpenStreetMap roads and trails, then calculated the loops locally. Frustratingly, the actual code it ran and exact details of what it did weren’t visible to me in the ChatGPT UI. I see this lack of transparency is an anti-feature. As for displaying the map to me, that used the visualize skill. It created a file called /workspace/el-granada-5k-share.html to embed directly into the ChatGPT UI. Here’s a copy of that HTML, which starts like this: Map data © OpenStreetMap contributors (() => { const root=document.getElementById('eg-share-loop'); The element contains the full geometry needed to render both the running route and the map itself, using D3, which is loaded from an allow-listed CDN location described in this section of the visualize skill: External resources The CSP allows only cdnjs.cloudflare.com, esm.sh, cdn.jsdelivr.net, unpkg.com, fonts.googleapis.com, fonts.gstatic.com, and fonts.bunny.net. Other origins are blocked and fail silently. More recent articles OpenAI agents attacked RubyGems back in May - 12th September 2026 Some thoughts on the Navier–Stokes Millennium Prize Problem - 8th September 2026 This is Generating running routes with GPT-6 Astra and ChatGPT Work by Simon Willison, posted on 12th September 2026. geospatial 85 ai 2,233 d3 15 openai 463 generative-ai 1,979 chatgpt 204 llms 1,945 skills 15 gpt-6-astra 9 Previous: OpenAI agents attacked RubyGems back in May Monthly briefing Sponsor me for $10/month and get a curated email digest of the month's most important LLM developments. Pay me to send you less! Sponsor & subscribe Disclosures Colophon © 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026