Your custom GPT is being retired. Its actions won't migrate.

The parts migration drops

OpenAI's migration tool moves instructions and knowledge files. It does not rebuild the three things that make a GPT valuable:

• Custom actions — every API call your GPT makes must be rebuilt as an MCP server. This is the big one.
• Sharing links — “anyone with the link” GPTs have no direct successor. External users need a new delivery path.
• Behaviour — a migrated plugin responds differently. Without regression testing, you find out from your customers.

Actions become MCP servers

We take your GPT's action schema and convert it into a production MCP server — hosted, secured and connected to your new plugin. Every endpoint becomes a tool. Auth is rebuilt properly. Nothing lives on a throwaway URL.

Then we run your ten most-used prompts against the old GPT and the new plugin, side by side, and fix what diverged.

Free migration audit

Send us your GPT's action schema. Within 48 hours you get a written report: what migrates cleanly, what breaks, what it takes to fix, and a fixed quote. No obligation — the report is yours either way.

If your GPT has no actions, the audit will tell you that too — and you'll know you're safe before the deadline, not after.

Hosted and maintained

A migrated plugin depends on a live MCP server — forever. We host and maintain yours on infrastructure built to outlast the migration window, so the December deadline is the last time you think about this.

Asked and answered

What exactly migrates when OpenAI retires my custom GPT?

Instructions and knowledge files carry over. Custom actions (every API call your GPT makes), sharing links, and your audience do not. If your GPT calls an API, that capability breaks on 11 December 2026 unless it is rebuilt as an MCP server.

My GPT has no custom actions. Do I need to do anything?

Probably not — but verify, don't assume. The free audit will confirm it in writing, so you know you're safe before the deadline rather than finding out after.

What does the free audit involve?

You send your GPT’s action schema (paste it or attach it). Within 48 hours you get a written report: what migrates cleanly, what breaks, what it takes to fix, and a fixed quote. No obligation — the report is yours either way.

What is an MCP server and why does my GPT need one?

MCP (Model Context Protocol) is how plugins talk to external APIs. Every endpoint in your GPT’s action schema becomes a tool on the server, with auth rebuilt properly. The plugin calls the server; the server calls your API.

Who hosts the MCP server after migration?

We do. A migrated plugin depends on a live MCP server forever, so hosting and maintenance are part of the offer — the December deadline is the last time you think about this.

How long does a migration take?

The audit is 48 hours. A typical rebuild — converter pass, manual fixes, auth, regression testing against your ten most-used prompts — is days, not months. Starting early beats the December queue.