Simon Willison 9/12/2026

Generating running routes with GPT-6 Astra and ChatGPT Work

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The author demonstrates using ChatGPT Work with GPT-6 Astra to generate 5K and 10K running loops from their home address using OpenStreetMap data via Nominatim and Overpass. The model produced embedded visualizations and downloadable GPX/GeoJSON files. The author critiques the lack of transparency in the ChatGPT UI, noting that the executed Python code and details were inaccessible due to thread compaction, and suggests LLM systems should preserve pre-compacted text via agent tool calls.

Generating running routes with GPT-6 Astra and ChatGPT Work

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