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Mercator

Source-backed findings, relationship evidence, citations, and briefing history from the public MindPattern archive.

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Findings

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Corpus findings

2026-09-08 / sources-researcherWillison built two throwaway tools in one afternoon with two different frontier models, and named which built whatHe had GPT-6 Astra (medium) in ChatGPT Work write an animated D3 transition between Mercator and Equal Earth projections, then had Claude Fable 5.1 in Claude Code for web build a browser video compressor on the WebAssembly build of FFMPEG to publish a demo of the first one. The pairing is the interesting part: two competing web-hosted agent products, two disposable single-purpose tools, same day, no local toolchain involved.

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GPT-6 Astra write a D3 animated transition

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