chatgpt: split into chatgpt and chatgpt-classic

As of July 9, 2026, ChatGPT has renamed their existing desktop app to "ChatGPT Classic" and introduced a new "ChatGPT" app. The new app is intended to eventually replace the old one. The two apps are currently not feature-equivalent, but the new app has most of the existing functionality of the old one.

This change renames the old package to chatgpt-classic and retargets chatgpt at the new app. Both app versions were also updated to latest available.

Assisted-by: Claude Code (Sonnet 5, claude-sonnet-5)

nixos/doc/manual/release-notes/rl-2611.section.md

@@ -160,6 +160,8 @@
 
 - [firefox-syncserver.database.type](#opt-services.firefox-syncserver.database.type) no longer defaults to `"mysql"`. You must now explicitly choose between `"mysql"` and `"postgresql"`. New deployments should prefer PostgreSQL.
 
+- `chatgpt` has been retargeted to OpenAI's new ChatGPT desktop app, while the previous app has been renamed to `chatgpt-classic`.
+
 ## Other Notable Changes {#sec-release-26.11-notable-changes}
 
 <!-- To avoid merge conflicts, consider adding your item at an arbitrary place in the list instead. -->

pkgs/by-name/ch/chatgpt-classic/package.nix

@@ -0,0 +1,61 @@
+{
+  lib,
+  stdenvNoCC,
+  fetchurl,
+  xar,
+  cpio,
+  unzip,
+}:
+
+let
+  source = import ./source.nix;
+in
+stdenvNoCC.mkDerivation {
+  pname = "chatgpt-classic";
+  inherit (source) version;
+
+  src = fetchurl source.src;
+
+  strictDeps = true;
+  __structuredAttrs = true;
+
+  nativeBuildInputs = [
+    xar
+    cpio
+    unzip
+  ];
+
+  unpackPhase = ''
+    runHook preUnpack
+
+    xar -xf "$src"
+    zcat Payload | cpio -i
+    unzip -q "Library/Application Support/OpenAI/ChatGPT Classic Update/ChatGPT Classic.app.zip"
+
+    runHook postUnpack
+  '';
+
+  installPhase = ''
+    runHook preInstall
+
+    mkdir -p "$out/Applications"
+    mkdir -p "$out/bin"
+    cp -a "ChatGPT Classic.app" "$out/Applications"
+    ln -s "$out/Applications/ChatGPT Classic.app/Contents/MacOS/ChatGPT Classic" "$out/bin/ChatGPT Classic"
+
+    runHook postInstall
+  '';
+
+  passthru.updateScript = ./update.sh;
+
+  meta = {
+    description = "Desktop application for ChatGPT Classic";
+    homepage = "https://openai.com/chatgpt/desktop/";
+    changelog = "https://help.openai.com/en/articles/9703738-macos-app-release-notes";
+    license = lib.licenses.unfree;
+    maintainers = with lib.maintainers; [ wattmto ];
+    platforms = lib.platforms.darwin;
+    sourceProvenance = with lib.sourceTypes; [ binaryNativeCode ];
+    mainProgram = "ChatGPT Classic";
+  };
+}

pkgs/by-name/ch/chatgpt-classic/source.nix

@@ -0,0 +1,7 @@
+{
+  version = "1.2026.184";
+  src = {
+    url = "https://persistent.oaistatic.com/sidekick/public/ChatGPT_Classic.pkg";
+    hash = "sha256-uj7mpU4tSsEBr2Ypwnu7bdeogCVrrMQs/MWW34CS5Jk=";
+  };
+}

pkgs/by-name/ch/chatgpt-classic/update.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p curl libxml2
+
+XML_URL="https://persistent.oaistatic.com/sidekick/public/sparkle_public_appcast.xml"
+
+XML_DATA=$(curl -s $XML_URL)
+
+LATEST_VERSION=$(echo "$XML_DATA" | xmllint --xpath '/rss/channel/item[1]/*[local-name()="shortVersionString"]/text()' -)
+DOWNLOAD_URL=$(echo "$XML_DATA" | xmllint --xpath 'string(//item[1]/enclosure/@url)' -)
+
+HASH=$(nix-prefetch-url $DOWNLOAD_URL | xargs nix --extra-experimental-features nix-command hash convert --hash-algo sha256)
+
+SOURCE_NIX="$(dirname ${BASH_SOURCE[0]})/source.nix"
+
+cat > "${SOURCE_NIX}" << _EOF_
+{
+  version = "$LATEST_VERSION";
+  src = {
+    url = "$DOWNLOAD_URL";
+    hash = "$HASH";
+  };
+}
+_EOF_

pkgs/by-name/ch/chatgpt/package.nix

@@ -2,8 +2,7 @@
   lib,
   stdenvNoCC,
   fetchurl,
-  _7zz,
-  undmg,
+  unzip,
 }:
 
 let
@@ -15,8 +14,11 @@ stdenvNoCC.mkDerivation {
 
   src = fetchurl source.src;
 
+  strictDeps = true;
+  __structuredAttrs = true;
+
   nativeBuildInputs = [
-    undmg
+    unzip
   ];
 
   sourceRoot = ".";

pkgs/by-name/ch/chatgpt/source.nix

@@ -1,7 +1,7 @@
 {
-  version = "1.2026.119";
+  version = "26.803.81509";
   src = {
-    url = "https://persistent.oaistatic.com/sidekick/public/ChatGPT_Desktop_public_1.2026.119_1780053722.dmg";
-    hash = "sha256-2RNQ7KS/Bf1boJHpC5qWNdFsWf+NoOVlXqZVEUf7Kh0=";
+    url = "https://persistent.oaistatic.com/codex-app-prod/ChatGPT-darwin-arm64-26.803.81509.zip";
+    hash = "sha256-NMfmKWeK1dY6Y57GlKW4O4X04b18Ie4qvP77sEEJW5w=";
   };
 }

pkgs/by-name/ch/chatgpt/update.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env nix-shell
 #!nix-shell -i bash -p curl libxml2
 
-XML_URL="https://persistent.oaistatic.com/sidekick/public/sparkle_public_appcast.xml"
+XML_URL="https://persistent.oaistatic.com/codex-app-prod/appcast.xml"
 
 XML_DATA=$(curl -s $XML_URL)