How to use ChatGPT and Claude together

If you're already paying for both, the useful question isn't which one wins. It's how to divide the work — and what to do about the part nobody writes about: re-explaining your situation every time you cross over.

Plenty of people running client work now pay for both. Not out of indecision — they've found that one suits how they draft and the other suits how they think through a long document, and a second subscription is a rounding error against the hours. The problem shows up later, in the crossing over.

Here's a way to split the two that holds up, what to do on the occasions you have to cross over anyway, and the part of the problem no split can fix.

1. Start with what each one structurally gives you

Quality comparisons date within weeks, and your own judgment about which one writes in your voice is worth more than anyone's league table. What lasts longer are the structural differences — the things that change how you'd organise your work around each one.

Every row read on 2026-08-25 from the vendors' own pages. ChatGPT: OpenAI's Memory FAQ (help.openai.com, article 8590148) for the control, the memory summary, sources and Temporary Chats; OpenAI's dreaming announcement of 4 June 2026 for the April 2025 origin, this year's rollout and the four tier names. Claude: Anthropic's help centre article on chat search and memory (support.claude.com, article 11817273) for the toggle, the memory panel, citations, incognito chats and each project's "own separate memory space"; its projects article (9517075) for the five-project cap on free accounts; claude.com/pricing for unlimited projects on Pro and for the prices. ChatGPT's prices aren't quoted here — chatgpt.com/pricing renders them dynamically, so read them there. Both products change these things often, so treat your own settings screen as the authority on any row.

2. Pick a default and a specialist — not two defaults

The failure mode isn't using both. It's using both for the same thing, so half your context ends up in each and neither has the whole picture. Decide once:

• One is your default. The one you open without thinking — quick questions, first drafts, the thing you're doing twenty times a day.
• The other is your specialist, reserved for a named category of work. "Long documents." "Thinking through a recommendation before I write it." "Anything client-sensitive I want to reason about carefully." One category, written down, so the choice isn't a daily decision.
• Never split one engagement across both. If the Acme pricing work lives in Claude, it stays in Claude. Splitting one piece of work across two assistants is how you end up briefing both and trusting neither.

That last rule does most of the work. Crossing over is cheap when the two are handling different things and expensive when they're handling the same thing.

Then give each engagement one container inside whichever assistant owns it. In Claude that's a project — Anthropic caps free accounts at five and lists unlimited projects on Pro, and says each project has "its own separate memory space", so the Acme work doesn't bleed into the Brightline work or into your ordinary chats (checked 2026-08-25). The practical effect is that the assistant you assigned to an engagement opens already inside it, which is most of what you were re-explaining.

3. When you do have to cross over

Two moves, each about a minute. Ask the assistant you're leaving to write the handoff for you — "summarise everything you know about this engagement as ten bullets I can paste into another assistant" — and paste that in. Or keep a six-line brief per engagement in a note: who and what, decided so far, open right now, constraints, voice and format, what you want from this session. Paste it at the top of a new conversation in either product.

Both work. Both have the same ceiling — a summary you maintain by hand, current only to the last time you touched it, and no way to reach the material it was made from. The workarounds and where each one runs out are worked through in why your AI assistant forgets when you switch tools. What matters here is the next question: why the crossing costs anything at all.

4. The part no split can fix

Look at what goes into that brief. Almost all of it started somewhere else — the client's Tuesday email, the pricing PDF, what was said on the call last month, the voice memo you dictated in the car afterwards.

Both assistants remember now, and remember well. With memory switched on, OpenAI describes ChatGPT as remembering context from "your chats, files, and connected apps"; Anthropic says Claude generates memory from your chats and focuses on work-related context — your role, your projects, how you like to work (both checked 2026-08-25). Neither is the narrow thing it was two years ago.

But read OpenAI's list again, because it's also the list of ways in. Chats — you typed it. Files — you uploaded it. Connected apps — you handed over an account. Claude's is narrower still: what you said to Claude.

What isn't on that list is a way to send one thread. The nearest thing available is connecting the whole account the thread lives in, which is a far bigger decision than the thread was: if several client engagements run through one inbox, access granted for one of them is access granted for all of them. Plenty of people reasonably decline — and then fall back to pasting.

So short of handing over a whole account, the material your work actually runs on reaches these tools only by you carrying it there, piece by piece — and, once you're running two, twice.

That's why the handoff never stops being annoying no matter how well you split the two. The split isn't the problem. The problem is that the record only exists inside the assistants, on whatever terms each one offers for getting it in there.

A different answer: keep the record outside both

This is what Equerry is built for — a personal assistant that holds the material you work from, so neither chat tool has to double as your archive.

What that looks like for someone running several client engagements:

• CC or forward the threads that matter. Add your Equerry address (something like mark@mail.getequerry.app) to a live client thread and every reply after that lands automatically — including the revised scope that turns up on Friday evening, after you've shut the laptop. No mailbox access, nothing swept in that you didn't send.
• Share the rest the way you already capture it. A PDF or screenshot through the share sheet, a photo of a whiteboard, a voice memo dictated after a call, a typed note.
• Ask in plain language later. "What did the CFO say about pricing in October?" — and the answer opens the original email or note it came from, so you're reading the actual wording, not a summary of it.
• Get briefed before the call. A morning brief that reflects yesterday's late reply, so you walk into the 9 AM already current.
• See and delete what it kept. Every remembered fact is listed, sourced, and removable. You decide what stays.

None of that replaces ChatGPT or Claude, and it isn't meant to. Keep using each for whatever you already prefer it for — the drafting, the long-document thinking, the specialist category you assigned it. What changes is that the running brief stops being something you maintain by hand, because the record isn't trapped in either chat window in the first place.

If you're paying for two assistants and still re-explaining yourself to both, that's the shift worth making. See how your emails, notes and documents work together, or read the honest comparison of ChatGPT memory vs Claude memory.

Last updated 2026-08-25.

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