What’s the best way to give ChatGPT, Claude, and Gemini the same memory?

by Benjamin a. Mowinckel · checked 2 November 2026

None of the three syncs its memory with the others, so the real options are each app’s own import, one document you keep yourself, a memory add-on such as MemoryPlugin, a memory server your tools connect to, or a record in files you own, such as alexandria.

Each app’s import suits someone moving from one app to another. Claude and Gemini each give you a prompt to paste into the app you’re leaving, then take in what it writes out, and Gemini also takes a ChatGPT or Claude chat export. It’s a snapshot, so what you tell one app afterwards stays there.

One document you keep suits someone who uses each app now and then. Write who you are and what you’re working on in one file, and paste it in or attach it at the start of a chat. It costs nothing and works everywhere, and it’s only as current as your last edit.

A memory add-on suits someone who wants it to happen without thinking. MemoryPlugin works in its browser extension across ChatGPT, Claude, Gemini, and about twenty other apps, saving memories and adding them to new chats. It is paid, with a free trial, and your memories live on its servers.

A memory server suits developers. Tools such as Basic Memory or Supermemory connect over MCP, the standard most coding tools and some chat apps use to reach outside tools, so each app that can add one reads and writes the same store.

A record in files you own suits someone who wants every tool, today’s and the next, to start from the same place. That’s what I built alexandria. to be, and it’s a blueprint rather than an app: your own model reads it and builds the record on your computer.

Compared on each product’s own site, 2 November 2026.

How does alexandria. do it?

On your computer, Claude Code, Codex, and Cursor read the record before they help and save back what you said and made, and each conversation in them is kept in your folder. ChatGPT, Claude, and Gemini read it through a copy they can open, such as one in your Google Drive, with a short block in each app’s saved instructions telling it to read the record first. Each app keeps its own memory on beside it, and what each has learned about you is drawn in on your yes.

Questions

Do the apps’ own memories stay on?

Yes. Nothing here switches off ChatGPT’s, Claude’s, or Gemini’s memory. Each keeps working exactly as before, and the record runs beside them.

What if I only use ChatGPT?

Then ChatGPT’s own memory may be all you need. The gap opens the day you use a second tool, or want to leave the first and take what it knows with you.

Can I do this with only a phone?

Partly. A chat app can keep a record in your Google Drive and save to it as you talk, but the fullest version needs a coding tool on a computer, which can keep files, settings, and a sign-in that last.

Does it work on Windows?

Yes. Claude Code, Codex, and Cursor run on Windows, and setup builds the same record there.

Can I use it on a work laptop?

That depends on what your employer allows you to install. If you can, tell your model to leave out work files, and it will, now or any time later.

Is Gemini’s import available everywhere?

No. When it launched on 26 March 2026, Gemini’s import wasn’t offered in the EEA, the UK, or Switzerland, so check your own settings before you count on it.

What does leaving cost?

Nothing, with alexandria. The record is plain files on your computer, and one command takes the system out of your tools and leaves the files where they are.

Show the blueprint to the model you use most, and it’ll tell you what you’re missing, if anything.