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Generating running routes with GPT-6 Astra and ChatGPT Work

AchievementProductSep 12, 2026

ChatGPT Work running GPT-6 Astra generated 5K and 10K running routes from a user's home address, working for 27 minutes and producing an embedded visualization plus downloadable GPX and GeoJSON files. The model used Nominatim and Overpass with OpenStreetMap data. The author notes the exact code was not visible in the ChatGPT UI, and after thread compaction the model could not provide the Python code it had used, which the author calls a transparency problem.

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Citation chain · 1 source

ChatGPT WorkModelGPT-6 AstraModel
Canonical: https://simonwillison.net/2026/Sep/12/astra-running-routes/