Start an independent Codex Replay controller on an available loopback port. In both Codex Desktop and Codex CLI, prefer an available Codex in-app browser and otherwise use your system browser. Select one or more historical Claude threads, choose shared Codex models, and start their isolated implementations. Historical state and configuration are detected separately for each thread, with details available when needed. View finished comparisons individually or in aggregate while remaining threads continue. Available GPT-5.6 Sol, Terra, and Luna models are selected by default. Multiple replay sessions can run in parallel. Selection, execution, verification, evaluation, and results stay in the browser controller instead of a guided chat workflow.
Runs locally: needs the ChatGPT desktop app or Codex with local execution enabled.
Install
- 1Add it in ChatGPT
Open Plugins in the ChatGPT sidebar (web or desktop), search for “Codex Replay” and select +. You'll be asked to sign in to any connected service on first use. Then type @ in a chat to call it.
Skills 1
- Codex Replay
Open independent Replay sessions in the available browser
Things to ask
- “Open an independent Codex Replay controller in the available browser.”
- “Open a new Codex Replay session so I can select and run a historical replay.”
- “Open Codex Replay so I can review my replay runs.”
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