{
 "schema_version": 1,
 "generated": "2026-10-20",
 "id": "kiyoakii-is-gpt-nerfed--detect-silent-model-downgrade",
 "repo": "kiyoakii/is-gpt-nerfed",
 "repo_url": "https://github.com/kiyoakii/is-gpt-nerfed",
 "repo_slug": "kiyoakii-is-gpt-nerfed",
 "title": "Catch a silent model downgrade in Codex",
 "page_title": "How to catch a silent model downgrade in Codex with Is GPT Nerfed",
 "summary": "Install the menu bar checker and get alerted when a Codex session answers with a different model.",
 "who": "A Codex user on a Mac who selected a specific model and suspects the answers come from a cheaper or different one.",
 "problem": "Codex can serve a different model than the one you picked, and nothing in the interface tells you.",
 "outcome": "The menu bar panel shows a verdict for each recent session, and a mismatch reaches you as a macOS notification, a message in the session, and a red face in the menu bar.",
 "steps": [
  "Open Terminal and run `curl -fsSL https://raw.githubusercontent.com/kiyoakii/is-gpt-nerfed/main/install-app.sh | sh`.",
  "If macOS blocks the first launch, allow IsGPTNerfed under System Settings → Privacy & Security.",
  "Click the face in the menu bar, press **Install**, and say yes when asked to trust the hooks.",
  "Work in Codex as usual. Each session is probed in the background after 30 minutes of activity.",
  "Open the menu bar panel, or run `nerfed report`, and read the last verdict for each session."
 ],
 "agent_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.",
 "agents": [
  "any"
 ],
 "difficulty": "Beginner",
 "time": "15 minutes",
 "basis": "readme",
 "caveat": "If the server swaps the weights but keeps the model name, only the fingerprint or a smaller context window can reveal it, and the bank only covers models it already knows.",
 "category": "Software and DevOps",
 "tags": [
  "Software and DevOps"
 ],
 "lang": "python",
 "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"
 ],
 "risk": "none",
 "seen_in_the_wild": false,
 "mentioned_publicly": false,
 "risks": [
  {
   "tag": "remote-script",
   "notice": "The install line pipes a script from GitHub straight into sh, so read it first if you do not trust the source."
  }
 ],
 "best": true,
 "score": 1.0,
 "evidence": [],
 "url": "https://dedupedai.com/use-cases/kiyoakii-is-gpt-nerfed/detect-silent-model-downgrade/",
 "md": "https://dedupedai.com/use-cases/kiyoakii-is-gpt-nerfed/detect-silent-model-downgrade/index.md",
 "disclaimer": "Deduped lists open-source repositories that belong to other people. We do not own, maintain, audit, or vouch for any of them, and a repo appearing here is not an endorsement or a safety check. The use cases, steps, and prompts are written by AI and may be incomplete, outdated, or just wrong. Where a use case is marked \"Seen in the wild\", we link to public posts where someone described something similar, but we have not verified those posts and the use case itself is still our AI's own write-up. Use all of this at your own risk. Only run code, commands, or agents on systems and accounts you are authorized to use, and read the code and every command before you run it, especially anything that touches credentials, files, or the network. Nothing here is professional, security, legal, or financial advice. All trademarks and project names belong to their respective owners, and their use here does not imply affiliation. Content is provided as is, without warranties of any kind. Found a mistake, a safety problem, or something you want removed? Email hello@dedupedai.com and we will look at it promptly.",
 "api": "https://dedupedai.com/api/v1/usecases/kiyoakii-is-gpt-nerfed--detect-silent-model-downgrade.json",
 "api_version": "v1"
}