How to move a Custom GPT to Claude

Claude details below come from Anthropic's help center, checked October 18, 2026. Plans and limits change, so confirm in the current documentation.

What a Claude Project is

Anthropic describes projects as self-contained workspaces with their own chat history and knowledge base. Each project can have custom instructions that shape responses, such as tone or a professional role, and you can upload documents and other files as project knowledge. Projects are available to all users, including free accounts, which are limited to five projects. On paid plans Claude switches to retrieval when knowledge nears context limits, and on Team and Enterprise plans you can share projects with members.

Steps

1. Export your instructions and gather your files.
2. In Claude, create a new project and give it your GPT's name.
3. Paste your instructions into the project's custom instructions.
4. Upload your knowledge files as project knowledge. Anthropic's article does not list supported file types or size limits, so check the current help center and convert unusual formats to PDF, DOCX or text.
5. Test with your saved questions: testing guide.
6. Share the project with teammates if your plan allows.

What does not carry over

• GPT Actions: a project does not run them. See Actions migration.
• ChatGPT-only features and the original model's behavior. Claude will answer differently, so expect to tune the instructions.
• Public sharing as a standalone bot. A project is a workspace, not a public page. For that, see hosting outside ChatGPT.

GPT Migrator can also host your bot using an Anthropic API key you provide, as an alternative to a Project.