OpenAI ends カスタム GPT on 12月11日, pushes Plugins

OpenAI is consolidating ChatGPT's builder tools around Plugins, which bundle reusable instructions, reference files, and connected apps. Migration is deliberately partial: instructions and knowledge files move over, but the chosen model, custom actions, and past conversations are left behind. The migrated Plugin is also created as private, and the original GPT's sharing settings do not carry over, so creators likely need to re-share it with their audiences.

For Enterprise workspaces, the timeline is tighter in one respect: new Custom GPT creation ends on 10月26日, and any draft that needs to move must be published before then. The shutdown itself is December 11, with an extension to 27年2月11日 only for workspaces that meet conditions and are approved for a deferral.

Consumers are largely bystanders. If you use a GPT someone else built, you cannot migrate it, you are not granted migration rights, and having access to the old GPT does not automatically grant access to a replacement Plugin. The practical stakes therefore hinge on whether creators act and re-share. The same pattern is appearing elsewhere, with Google's Gemini custom apps, Gem, also set to end in stages from November.