Which AI assistant has the best memory?

How do ChatGPT, Claude, Gemini, Grok and Perplexity compare on memory?

Each cell below comes from the vendor's own help pages, dated. Plans change often, so check your own account too.

Does ChatGPT or Claude have better memory?

It depends on how you work. ChatGPT reads past chats automatically. Claude builds memory from chat history on every plan, and on paid plans it can also search and cite past chats. Claude can also import memory from another assistant.

Two parts: saved memories, which are stored separately from chat history, and reference chat history, which lets ChatGPT use relevant information from past chats. ChatGPT can decide what to remember, or you can ask it. You view and manage both in Settings, Personalization, Memory. OpenAI says features vary by plan, region, platform and workspace settings. OpenAI Help Centre: Memory FAQ. Verified 21 October 2026.

Memory from chat history is available on every plan, including Free; on Enterprise an owner allows it. You view and edit, pause or reset it in Settings, Capabilities. Incognito chats are left out. Claude Help Centre: Memory. Verified 20 October 2026.

Searching and citing past chats is on paid plans (Pro, Max, Team and Enterprise). You switch it off in Settings, Capabilities, Search and reference chats. Claude Help Centre: Memory. Verified 20 October 2026.

An experimental import, on every plan on the web and desktop, brings memory across from another assistant: you run a prompt in the old assistant and paste the result into Settings, Memory. Claude Help Centre: Importing memory. Verified 17 October 2026.

Which assistant remembers you by default in the UK?

Google says Gemini's Memory is on by default in the UK. For ChatGPT, the default varies by plan, region and platform. Check the memory settings in your own account rather than assuming either way.

In the UK, Memory, which learns from past chats, is on by default. You can switch it off in Settings, Personal context, Memory. Google UK blog, 29 April 2026. Verified 17 October 2026.

Two parts: saved memories, which are stored separately from chat history, and reference chat history, which lets ChatGPT use relevant information from past chats. ChatGPT can decide what to remember, or you can ask it. You view and manage both in Settings, Personalization, Memory. OpenAI says features vary by plan, region, platform and workspace settings. OpenAI Help Centre: Memory FAQ. Verified 21 October 2026.

Can you take your assistant's memory with you?

None of the five names memory as part of its data export, and Perplexity has no self-serve export. Moving memory usually means an import prompt rather than a file.

Settings, Data controls, Export data gives a ZIP of chat history and account data, ready within 7 days, with a link that expires after 24 hours from receipt. Available on Free, Go, Plus, Pro and eligible Edu workspaces, not Business or Enterprise. Memory is not named as part of the export. OpenAI Help Centre: Exporting your ChatGPT history and data. Verified 21 October 2026.

Settings, Privacy, Export data, on the web or desktop app. The download link expires after 24 hours. Memory is not named as part of the export. Claude Help Centre: Exporting your data. Verified 17 October 2026.

Export runs through Google Takeout. Saved info is not named as part of the export. Gemini Apps Help: Export your Gemini data. Verified 17 October 2026.

Download and delete your data in Settings, Data Controls. Deletion completes within 30 days. xAI legal FAQ. Verified 20 October 2026.

No self-serve export. You can request access to your data, answered within 30 days. Perplexity Help Centre: GDPR at Perplexity. Verified 17 October 2026.

How do I move my memory from ChatGPT to Claude?

Already have an export? The Export Inspector shows what it holds, on your own device.

See what your AI export holds

Which assistant should you pick?

This is a list by need, not a ranking.

• You want automatic recall of past chats: ChatGPT. OpenAI Help Centre: Memory FAQ
• You want to see and cite past chats: Claude, on a paid plan. Claude Help Centre: Memory
• You want a list of saved facts you can edit: Gemini. Gemini Apps Help: Saved info
• You mostly search the web: Perplexity. Perplexity Help Centre: Memory
• You want custom connectors on any plan: Grok, or Claude with one connector on Free. xAI docs: Grok connectors, 10 October 2026Claude Help Centre: Custom connectors

What if you use more than one assistant?

Each assistant's memory is held by one company, so what ChatGPT knows about you does not reach Claude or Gemini. A separate memory layer that your assistants connect to through MCP is one option.

AI Twin is one such layer. Your memory is stored in the UK. Nothing is saved until you confirm. Duplicates and conflicts come to you to decide. It works with Claude, ChatGPT with developer mode, or another assistant that supports MCP connectors. Swap any time. Export any time. Everything is free for the first 7 days. No card needed. Add one when you decide to stay.

If you use one assistant and are happy with its memory, you do not need AI Twin.

The best AI memory apps in 2026

Is Claude memory free?

Memory from chat history is available on every plan, including Free; on Enterprise an owner allows it. You view and edit, pause or reset it in Settings, Capabilities. Incognito chats are left out. Searching and citing past chats is on paid plans (Pro, Max, Team and Enterprise). You switch it off in Settings, Capabilities, Search and reference chats.

Claude Help Centre: Memory. Verified 20 October 2026.

Claude Help Centre: Memory. Verified 20 October 2026.

Does Grok have memory?

Not documented by xAI as of 20 October 2026.

xAI legal FAQ. Verified 20 October 2026.

Does turning off ChatGPT memory delete my chats?

Two parts: saved memories, which are stored separately from chat history, and reference chat history, which lets ChatGPT use relevant information from past chats. ChatGPT can decide what to remember, or you can ask it. You view and manage both in Settings, Personalization, Memory. OpenAI says features vary by plan, region, platform and workspace settings.

OpenAI Help Centre: Memory FAQ. Verified 21 October 2026.

Can Gemini import memory from ChatGPT in the UK?

Google's own pages disagree on whether memory import is available in the UK: its UK blog says it is rolling out, while its help page says it is not available in the UK.

Gemini Apps Help: Import memory. Verified 17 October 2026.

Which AI assistant has the longest memory?

None of the five publishes a memory limit we can compare, and none claims infinite recall. What each one keeps is set by its own controls. Two parts: saved memories, which are stored separately from chat history, and reference chat history, which lets ChatGPT use relevant information from past chats. ChatGPT can decide what to remember, or you can ask it. You view and manage both in Settings, Personalization, Memory. OpenAI says features vary by plan, region, platform and workspace settings. Memory from chat history is available on every plan, including Free; on Enterprise an owner allows it. You view and edit, pause or reset it in Settings, Capabilities. Incognito chats are left out.

OpenAI Help Centre: Memory FAQ. Verified 21 October 2026.

Claude Help Centre: Memory. Verified 20 October 2026.