Migration fundamentals and planning
Custom GPT migration: the complete guideEverything about migrating a Custom GPT: why it is happening, your three options, what transfers, what breaks, and how to start today.Custom GPT retirement dates: what OpenAI has actually saidThe planned dates for retiring Custom GPTs, who they apply to, what happens to your original GPT, and what to do before the deadline.How to migrate a custom GPT, step by stepA practical walkthrough for migrating a Custom GPT: back it up, choose a path (OpenAI plugin, another platform, or self-hosting), rebuild, and test.Custom GPT migration checklistA complete checklist for migrating a Custom GPT without losing instructions, files or behavior: before, during and after you move.Custom GPT to plugin migration: how OpenAI's process worksOpenAI's Migrate to plugin flow explained: requirements, steps, what transfers, what does not, sharing, and what to test afterward.What transfers when you migrate a Custom GPTA clear table of what moves with OpenAI's plugin migration and what you must rebuild: instructions, files, actions, starters, model and chat history.Custom GPT conversation history: what happens when you migratePrevious chats may not copy when you migrate a Custom GPT. What OpenAI says, and how to keep your own records of important conversations.
Export, backup and preservation
How to export your Custom GPT instructionsGet your Custom GPT's instructions out of ChatGPT and into a file you keep: manual copy, the free Chrome extension, and what to do if you cannot see them.How to export and back up your Custom GPT knowledge filesHow to keep your Custom GPT's knowledge files safe: find the originals, version them, and plan how they load into a new platform.How to recover a Custom GPT's system promptWhat to do if you can no longer find your Custom GPT's instructions: places to look, the extension, and how to rebuild from the GPT's behavior.
Platform-specific migration guides
Alternatives and platform comparisons
Custom GPT alternatives: your options and how to chooseThe main alternatives to Custom GPTs: OpenAI plugins, Claude Projects, building on an API, hosted bot pages and chatbot builders, with a simple way to choose.Custom GPT vs plugin: what is the difference?How OpenAI plugins differ from Custom GPTs: structure (skills, MCP servers), sharing and installation, and what that means for migration.
Tools, pricing and services
How to host a Custom GPT outside ChatGPTWays to run your Custom GPT as a standalone chat page: what you need, what to look for in a host, and how GPT Migrator hosting works and where it stops.Custom GPT migration cost: what you will actually pay forThe cost components of migrating a Custom GPT: your time, model API usage, platform subscriptions and optional help, with a worksheet to estimate your own.Custom GPT migration service: free audit and rebuildsRequest a free audit of your Custom GPT. We tell you what will break, what moves as-is, and what a stable rebuild involves.Free Custom GPT migration toolPaste your GPT instructions, file names and Actions schema to get a readiness report and a portable bundle. Runs in your browser; nothing is uploaded.
APIs, integrations and technical migration
Migrating GPT Actions: what happens to your API callsCustom GPT Actions do not transfer through OpenAI's migration. How to inventory them and rebuild with apps or an MCP server.Rebuilding a Custom GPT with the OpenAI APIMoving a Custom GPT to a build on the OpenAI API: the Assistants API sunset, the Responses API mapping, and what you must build yourself.
Agency, business and monetization
Troubleshooting, testing and FAQs
How to test a migrated Custom GPT before relaunchingA simple test plan and scorecard to compare your migrated GPT with the original: real questions, tone, accuracy, files and connected tools.Custom GPT migration mistakes to avoidThe most common ways Custom GPT migrations go wrong, from skipping backups to forgetting Actions, and how to prevent each one.How long does Custom GPT migration take?What decides how long it takes to migrate a Custom GPT, from simple prompt-only bots to complex ones with Actions, plus how to plan the work.Custom GPT migration FAQAnswers to common Custom GPT migration questions: retirement dates, what replaces GPTs, exporting, Actions, plugins and hosting.