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What you can do with Is GPT Nerfed

A macOS menu bar app and Codex plugin that checks whether the model you selected in Codex is the one actually answering, and flags silent downgrades.

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kiyoakii/is-gpt-nerfed on GitHub

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What do you want to do?

3 use cases

  • Catch a silent model downgrade in Codex

    Install the menu bar checker and get alerted when a Codex session answers with a different model.

    View prompt
    In the kiyoakii/is-gpt-nerfed repo on macOS, install the app with the install-app.sh line from the README, then run `nerfed report`. Return the last verdict for each session listed, and check that every session shown in the menu bar panel appears in the output.

  • Probe a brand-new session before a long task

    Run the Fresh session probe to see which model a new Codex session gets right now.

    View prompt
    In the kiyoakii/is-gpt-nerfed repo, trigger a probe of the Fresh session from the menu bar app or with `nerfed probe now`, then report the verdict and the model you selected. Verify that the verdict is one of Match, Suspicious, Downgrade, Upgrade, Rerouted, Downgraded, Upgraded, Unlisted, or Invalid.

  • Stop tool use when a session shows a mismatch

    Turn on halt_on_mismatch so Codex blocks tools until you say resume after a mismatch.

    View prompt
    In the kiyoakii/is-gpt-nerfed repo, set halt_on_mismatch to true, then confirm the setting is saved with `nerfed config` output or the app Settings. Report the current value and whether a mismatch has blocked tools in any session.

How to use Is GPT Nerfed

  1. Check you have what it needs: A Mac running macOS 15 or newer; Codex with plugin hooks (the README says it was tested on 0.154), desktop app or CLI; The system python3.
  2. Open kiyoakii/is-gpt-nerfed on GitHub and read the README and license.
  3. Open Terminal and run curl -fsSL https://raw.githubusercontent.com/kiyoakii/is-gpt-nerfed/main/install-app.sh | sh.
  4. If macOS blocks the first launch, allow IsGPTNerfed under System Settings → Privacy & Security.
  5. Click the face in the menu bar, press **Install**, and say yes when asked to trust the hooks.
  6. Work in Codex as usual. Each session is probed in the background after 30 minutes of activity.

These steps come from our top use case, Catch a silent model downgrade in Codex, which also has a copy-paste agent prompt.

Is GPT Nerfed alternatives · Best AI repos for Software and DevOps

About this repo

Requirements

  • A Mac running macOS 15 or newer
  • Codex with plugin hooks (the README says it was tested on 0.154), desktop app or CLI
  • The system python3
  • Terminal access for the install line
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Questions about Is GPT Nerfed

What is Is GPT Nerfed?

A macOS menu bar app and Codex plugin that checks whether the model you selected in Codex is the one actually answering, and flags silent downgrades. It is an open-source project on GitHub: https://github.com/kiyoakii/is-gpt-nerfed.

Who is Is GPT Nerfed for?

Codex users on macOS who pay for a specific model and want to know if a session is quietly served by a different one.

What can I do with Is GPT Nerfed?

3 use cases so far, for example: Catch a silent model downgrade in Codex; Probe a brand-new session before a long task; Stop tool use when a session shows a mismatch. Each has steps and a copy-paste agent prompt.

What do I need to run Is GPT Nerfed?

A Mac running macOS 15 or newer; Codex with plugin hooks (the README says it was tested on 0.154), desktop app or CLI; The system python3; Terminal access for the install line.

What are alternatives to Is GPT Nerfed?

Other hot AI repos in Software and DevOps: Harness2, iFixAi, Orca, Diagram Design, AI Memory.

Is Is GPT Nerfed safe to run?

Deduped does not own, audit or vouch for it. Read the README and license, run it on your own systems first and review every command before you run it.