OpenAI Euphony: A Browser-Based Viewer for Harmony Conversations and Codex CLI Sessions

OpenAI Euphony: A Browser-Based Viewer for Harmony Conversations and Codex CLI Sessions OpenAI just shipped Euphony - an Apache 2.0 open source web app for inspecting two specific formats that have been a pain to read with a text editor: Harmony conversations - the structural wire format gpt-oss models are trained on Codex CLI sessions - the rollout-*.jsonl files auto-created by Codex CLI There's already a hosted build you can use without installing anything. Why Euphony Exists If you've ever looked at a raw Harmony conversation, you know the pain.