MarTech & AI
OpenAI Will Retire Custom GPTs on Dec. 11, 2026
OpenAI retires custom GPTs on Dec. 11, 2026, affecting all ChatGPT plans. Marketers must migrate voice-calibrated tools to plugins or lose them.
OpenAI will retire custom GPTs on Dec. 11, 2026, and is asking creators to migrate them to plugins — a change that affects all ChatGPT plans, according to the company's retirement and migration FAQ.
For marketing teams, the deadline threatens tools that took months to build. Getting a custom GPT to sound like a CEO was never a quick afternoon project, writes Stephanie Nivinskus, principal of Ragan's Center for AI Strategy. Teams wrote detailed instructions, uploaded approved messaging examples, tested, revised, and tested again until the voice calibration was locked in. Without a working replacement, the next person who needs that GPT will have to go back to doing things the way they were done before AI was part of the workflow.
Nivinskus lays out a five-step migration plan:
1. Find each GPT your team relies on. Ask colleagues which GPTs they use for recurring work, including tools built by consultants. Record each tool's owner and the assignment it supports, then designate someone to manage its replacement.
2. Save the instructions before the deadline. Copy each tool's full instructions into an approved company folder. Save its original reference files alongside them, plus an approved output that shows what good looks like. Marketers who have permission to use a tool but did not build it should contact its owner now.
3. Publish edits before migrating. OpenAI's migration uses the latest published GPT version — drafts and unpublished edits do not transfer. Publish essential changes first; public sharing is not required. OpenAI lists Oct. 26 as the planned Enterprise cutoff for creating new GPTs, and workspace administrators can confirm individual timelines.
4. Migrate and rebuild custom actions. When migration becomes available, users open My GPTs and select "Migrate to plugin." Custom actions do not transfer automatically. IT teams should rebuild and test any connection the GPT uses to interact with another service, resolving problems before rollout. An intended user should then confirm access by completing a real assignment.
5. Assign responsibility for the deadline. Each migration needs an owner and an early December internal deadline. By Dec. 11, that person must confirm the replacement works for the colleagues who depend on it.
The stakes go beyond tooling. The voice calibration and approved outputs built into those GPTs are worth protecting, Nivinskus argues. Teams that start the migration now preserve the brand voice and calibrated output they spent months perfecting — and avoid unwanted surprises later.
Original: help.openai.com
Elena Vasquez
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Senior reporter covering media and advertising at Marketing Herald.
