OpenAI's new Euphony tool works almost exactly the same way as my Codex transcript viewer https://tools.simonwillison.net/codex-timeline?url…

OpenAI's new Euphony tool works almost exactly the same way as my Codex transcript viewer https://tools.simonwillison.net/codex-timeline?url=https%3A%2F%2Fgist.githubusercontent.com%2Fsimonw%2Fa9eb5993a2853ec840d26c0e56bde362%2Fraw%2Fb8c5febdf60d878da84e27c07efdaed159abde4a%2Flogs.jsonl#tz=local&q=&type=all&payload=all&role=all&hide=1&truncate=1 Introducing Euphony, an open-source tool for visualizing chat data and Codex session logs. Paste in a public URL or upload a local file, and Euphony turns the raw data into an easy-to-browse view. It supports translation, filtering, editing, and more.

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Source: Simon Willison (X) | 2026-04-21