Not sure where to move your GPTs? Five yes-or-no questions, about 30 seconds.
{questions[step].q}
{recommendTM ? "Rebuild your GPTs as TypingMind AI Agents" : "OpenAI's plugin migration should be enough"}
{recommendTM ?Based on your answers, here's why:
You only need OpenAI models and don't depend on Custom Actions, so the built-in "Migrate to plugin" option is the fastest route. Sharing settings don't carry over, so re-invite anyone who uses your GPTs. If you later want multi-model agents or more control, the TypingMind steps below still apply.
}{complete ? "All done. You're ready for December 11." : done + " of " + all.length + " steps done"}
Your progress is saved in this browser.
{phase.name}
Not sure where to move your GPTs? Five yes-or-no questions, about 30 seconds.
{questions[step].q}
{recommendTM ? "Rebuild your GPTs as TypingMind AI Agents" : "OpenAI's plugin migration should be enough"}
{recommendTM ?Based on your answers, here's why:
You only need OpenAI models and don't depend on Custom Actions, so the built-in "Migrate to plugin" option is the fastest route. Sharing settings don't carry over, so re-invite anyone who uses your GPTs. If you later want multi-model agents or more control, the TypingMind steps below still apply.
}{complete ? "All done. You're ready for December 11." : done + " of " + all.length + " steps done"}
Your progress is saved in this browser.
{phase.name}
## What's changing
On September 11, 2026, OpenAI announced it will retire Custom GPTs on every ChatGPT plan and replace them with **ChatGPT Plugins**.
| Date | What happens |
| :--------------- | :--------------------------------------------- |
| Sep 11 | Retirement announced |
| Oct 26 (planned) | New GPT creation ends in Enterprise workspaces |
| Dec 11 | Custom GPTs stop running |
Personal plans (Free, Go, Plus, Pro) already can't create new GPTs. Timing can vary by workspace, so check your account notifications.
OpenAI's built-in migration only moves part of a GPT:
| Moves to a plugin | Doesn't move |
| :------------------------ | :------------------------- |
| Instructions (as a skill) | Custom Actions |
| Knowledge files | Your chosen model |
| Connected apps | Past conversations |
| | Sharing settings and users |
Once migrated, the original GPT becomes read-only. If your GPT does more than instructions and files, you're rebuilding part of it either way, so it's worth choosing where.
## Why TypingMind AI Agents
AI Agents are TypingMind's equivalent of Custom GPTs: reusable assistants with their own instructions, knowledge, and tools, without being tied to one provider.
### Step 5: Turn on tools
Replace each capability your GPT used:
| GPT capability | In TypingMind |
| :--------------------------------- | :------------------------------------------------------------------------------ |
| Web search | The model's built-in web tool, or a search plugin such as Perplexity or SerpAPI |
| Image generation | GPT Image Editor or Stable Diffusion plugin |
| Code Interpreter and data analysis | Code Sandbox |
1. Open **Plugins** in the left sidebar, install the plugins you need, and fill in any settings they ask for.
2. In the agent editor, toggle **Plugins** under **Skills** and select them.
### Step 6: Rebuild Custom Actions as plugins
Each Custom Action becomes a **TypingMind plugin**. Every operation in the action's OpenAPI schema turns into one plugin function that calls the same API.
| In your GPT Action | In a TypingMind plugin |
| :------------------------------- | :------------------------------------------------------------------------- |
| Each operation (`operationId`) | One function, defined by an **OpenAI Function Spec** |
| Operation summary and parameters | The function's `description` and `parameters` |
| Server URL, path, and method | The **HTTP Action** method and endpoint URL |
| API key authentication | A **User Settings** field, used as `{apiKey}` in a header |
| OAuth | The plugin's **OAuth 2.0** settings, used as `{OAUTH_PLUGIN_ACCESS_TOKEN}` |
| Response | The **output**: give it to the AI, or render it as Markdown or HTML |
Learn more about how to [build custom plugins on TypingMind](/plugins/build-a-typingmind-plugin)
### Step 7: Test side by side
Finish this before December 11, while the original GPT still runs.
1. Collect a handful of real prompts you've used with the GPT, including ones that trigger its knowledge and actions.
2. Run each prompt in the old GPT and the new agent. Compare tone, format, accuracy, and whether the right tools were called.
3. Adjust the instructions, model, or parameters until the agent matches or beats the original. Agent version history lets you roll back any change.
{complete ? "All done. You're ready for December 11." : done + " of " + all.length + " steps done"}
Your progress is saved in this browser.
{phase.name}